Topic Change: Cool Mac apps

Hello,
I'm still quite unsure about blogging but it's something kinda like making a youtube video right? Whatever, well since I have been searching for decent mac applications all over the internet, I would like to share my 5 favorite free mac applications.

5. iAlertU - http://slappingturtle.com/home/index.php?option=com_content&task=blogcategory&id=14&Itemid=58
4. GrandPerspective - http://grandperspectiv.sourceforge.net/
3. Sidenote - www.chatelp.org/?s=Sidenote
2. Quicksilver - http://www.versiontracker.com/dyn/moreinfo/macosx/22549
1. Firefox 3 - http://www.mozilla.com/en-US/firefox/all.html

5. iAlertU keeps your computer safe w/ icon in the menu bar.
4. GrandPerspective shows you a type of graph on your computer, basically your data, used for seeing what things are taking up too much space.
3. Sidenote is a sidenote. =] it pops out from the left right or bottom part of your screen its kind of like a drawer where you can take notes on.
2. Quicksilver is a nice application launcher and can run a lot of commands and triggers.
1. Firefox 3 is a web browser, it's much faster than safari!

What mac apps do you know of? Share them in the comment area.

Thanks ;)