NetworkText - Send SMS messages to everyone in a group, free. You define the groups. This is great for work teams (e.g. meeting cancelled), as well as after-work events and notifying family members.
Rip Off Report - Have you been ripped off? Write about it online - better yet, check before you buy/invest
Xpensr - Record and track your business expenses with your mobile phone - I admit that I use little pieces of paper for this, but I probably should use something like Xpensr.
Tumblr - the fastest way to create a quick multi-media blog including video, images, audio, text, chat, etc. free
Top-40 GIMP Plugins - If you are a fan of the free photoshop-like tool called GIMP, then you will want to check out these great plugins.