After few days on my Mac, I found:
Journler- A powerful, cheap, complete note taking, organizer, program.
Wile it's not strong as MSFT OneNote 2007, it's quite good for a replacement.
Good app for a student.
http://journler.com/
Sidenotes- A small multi quick-note taking program.
It hide on the side of the screen and it's useful when having quick notes to write.
It support text and pictures drag-n-drop as well.
http://www.chatelp.org/?page_id=5Desktopia- A wall paper changer that you set to change walls according the time of the day
http://www.chatelp.org/?page_id=6Butler- I didn't play with it yet, but it's a VERY strong app
It's hard to explain all the features it have, so just check it out
http://www.manytricks.com/butler/Plainview- a FullScreen Webkit browser
For the fullscreen lover or people that make presentations of webpages (Designers will fall in love with this)
http://www.barbariangroup.com/software/plainview_app_1_0MultiClutch- A very useful PrefPane for all MacBook Air, MacBook Pro and L08 MacBook owners
It allow to change the behavior of the multitouch gestures for different functions
Changes can be Global or you can add any Cocoa Apps (Carbon isn't supported) to make app specific commands.
(Unfortunately it don't support the 4 fingers Gestures yet)
http://wcrawford.org/2008/02/28/everytime-...-touch-my-cell/BTW, Opera have a MacOSX version you know?
Why it's not in the list?
http://www.opera.com/download/?os=mac&list=all