SpreadTweet hides your Twitter stream in a fake Excel window
It's yet another Twitter client built on Adobe Air, but obviously there's a bit of a twist - it camouflages your stream as a Microsoft Excel workbook. Three skins are available to ensure it blends in on your system: 2003, 2007, and OSX.
No avatars are displayed. There's no TwitPic or URL shortening support. Everything is displayed in boring old plain text, so you'll have to copy and paste links you want to browse.
I'd never use this as an everyday client, but I did actually find it handy for one thing: locating users that incessantly flood my stream with retweets. It's easy to spot the RT @personwithoriginalthought in SpreadTweet's plain text columns.
One super-duper, ultra-critical note: by downloading the software, you "absolve [the developer] of any and all responsibility" and agree to bring him cookies and beer if he goes to jail.