Omnigraffle – Visio type flowcharting app. Even the demo version is useful for simple charts.
Senuti -xfer ipod songs to computer
http://www.barebones.com/products/textwrangler/>Textwrangler – great free text editor if you can’t justify the $125 for BBEdit.

Glad gimpshop was on one of those lists, although I’ve found it a bit unstable.
Flip4mac is also an essential on my list.

Good lists though.