HTML Box: http://apps.facebook.com/htmlbox This does what it sounds like it does, while the UI’s a bit wonky, it’s still pretty useful.

I used to use myRSS: http://apps.facebook.com/myrssfeeds/index.php until you mentioned and i installed flogblog. (Thanks!)

I Want: http://apps.facebook.com/wantitnow/wants
From ThisNext.com, its a way for you to use your friends on facebook to help you find cool stuff. You can either use the inventory on facebook, or insert by URL a product from any other site on the web.

Files: http://apps.facebook.com/files/
From Box.net it allows you to store up to 1 gig of files. While its a good way to store files, they’re downloadable by any of your friends and theres not a way to restrict access yet.

thanks for putting this together.