If you are looking to clean up a clogged up Twitter account, like the people asking questions here and here, this utility might be just what you are looking for (make sure you note the deletion caveats mentioned in those links though):
Announcing TweetDelete, the Twitter Mass Delete / Cleanup Utility that helps you mass-delete Outgoing Tweets, and Incoming and Outgoing DMs.
This is a very-much-beta version, and donationware. Use the feedback form if you find any problems (which I'm sure there are plenty), and if it proves valuable to you, feel free to donate to the cause.
Download TweetDelete here. No install required -- just download and run. : )
02/18/2012 NOTE: THIS APPLICATION NO LONGER WORKS. See update at bottom for more info.
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Update: Having some issues with the update server; if you get in an endless loop of "checking for updates" clicking "Next" on the welcome tab, you can skip to the login section directly via the numbered tabs at the top. Should be squared away tomorrow if it's still a problem.
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Update: New release (minor edits, modified expiration date) released today 07/20/2009. Apologies to the folks who got caught by the expiration period.
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Update: 08/18/2009 Users have recently begun reporting "mo Messages found to to delete" as the result they are getting, and I now get the same result here. Looks like Twitter has changed their API, blocked this app in some way, or something along those lines.
Given the minimal support/contributions this app has received thus far, it's not high on my priority list, but I do plan to look into it eventually. Currently this app appears to no longer work, due to changes in the Twitter service.
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Update: 09/21/2009 A number of daring souls have tried the app in its current form anyway, and feedback comments (built into the app) seem to indicate positive result. Your mileage may vary, but feel free to try it out, and let me know how it works for you.
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Update: 02/10/2010 This current install is expired, and no longer works. An update version is in the works, however, and should be released sometime in the next few weeks.
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Update 03/15/2010 TweetDelete has finally been updated, and now includes archiving capability. Download at the link listed above and let me know (via the built-in feedback form) how it works out for you.
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Update 12/29/2010 Updated for newer Twitter authorization scheme, minor bug fixes, and easier save-to-text-file capability.
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Update 07/08/2011 The current version is expired. Please check back in two weeks for the updated version.
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Update 02/18/2012 OK, that was a LONG "two weeks." Sorry. The issues of dealing with Twitter's API cantankerousness has gotten worse with time; only one or two users donated financially to this project (wasn't my primary motive obviuosly, so not a big deal, but not exactly inspiring me to work harder on it, either); and there are a number of alternatives out there now as well (this was initially created simply to meet an unmet need, when nothing similar existed)...SO...... I'm going to punt. There are much more interesting projects to work on, and I think this one's run its course.
I'm playing with a few web-based alternatives (created by others) currently. I can't vouch for any of them, but you may want to check out Tweet_Deleter, and/or TweetEraser.
Best of luck with your Twitter mass-deletion needs, and my sincere thanks to those who took the time to say "thanks" or otherwise leave an encouraging word here or elsewhere. We all could probably afford to spend more of our energy doing that, and should.
Nice job, works perfectly. Thank you!
Posted by: scott | May 07, 2009 at 05:10 AM
Worked for me, thanks. I had to use this to clear onr of my zombie accounts that I decided to use legitimately.
Awesome awesome tool. 6 Thumbs up
Posted by: mikhail | September 21, 2009 at 02:10 AM
Is this working for anyone?
Posted by: meh | April 07, 2011 at 03:42 PM
How do you run this on a mac?
Posted by: amberlandia | April 25, 2011 at 01:16 PM
It doesn't work. #2This version of TweetMassDelete is
expired. Please download the
latest version."
This is what it tells me to do. But i don't find any update version of it. Do you have one?
Posted by: konwall | July 04, 2011 at 03:56 AM
It says "This verison of TweetMassDelete is expired, please download the latest version." but when I search for updates it says there isn't any...? Help please? I need this!
Posted by: :) | July 08, 2011 at 10:12 PM
Just wondering when the new version will be posted... I'd really love to try this program out! My timeline is a mess.
Posted by: Kittenish Cutie | August 17, 2011 at 04:48 PM
Very nice work there, dude.
So hopeful here for the new version. ;)
Posted by: Czar | August 19, 2011 at 10:43 AM
23-9-2011: it's expired and can't be updated. Is it going to be working any soon?
Posted by: selina | September 23, 2011 at 03:13 AM
OK, guys, im here to offer you another service- tweetdeleter.com - you might see it usefull.
What does it do? It allows you to delete multiple tweets within specific time, date or keywords. Just check it out! (its was launched on 20.11 in garage48.org event and is working as beta version now). you are welcome to use it and share ideas- what would you like to have in that kind of service ;)
Posted by: TweetDeleter | December 07, 2011 at 02:28 AM
Found this app just an hour or so ago, downloaded it from what ever website I was on, and it said out of date. I came here thinking this would be a great tool; sorry to hear you have discontinued support and development.
Posted by: Vince | July 19, 2012 at 03:36 AM