This trick is not really new but thought it would be nice to share.
iPhone: http://www.facebook.com/connect/prompt_feed.php?api_key=3e7c78e35a76a9299309885393%20b02d97
Android: http://www.facebook.com/connect/prompt_feed.php?api_key=882a8490361da98702bf97a021ddc14d
BlackBerry: http://www.facebook.com/connect/prompt_feed.php?api_key=2254487659
or alternatively, you can visit this site: http://fbpostvia.zymichost.com
Now everyone can post via iPhone, Android or Blackberry! Hehe
*The 3 links above will resize your window. Re-maximize it to view the Facebook form.