Avid iPhoners and iPhonerettes should check out these worthy of mentioning apps; that’s to say, if you haven’t installed or heard about them already. Most are available via Installer.app or just follow the individual source links.

In no particular order, we have:

SMSD — Lets you delete or forward individual SMS messages
code.google.com/p/iphone-smsd

MMS — Name says it all
add http://modmyifone.com/installer.xml to Installer.app sources
modmyifone.com

Make It Mine — Lets you set anything as your ‘carrier’ easily
Erica Sadun is awesome

ScreenShot — Easily capture screenshots
robota.nl

Sysinfo — Again, name says it all
robota.nl

Taskbar Notifier — Add status bar icons for unread SMS or email
code.google.com/p/taskbar-notifier

Enjoy!

Thanks for compiling this list Leif.