Here's my list with links where appropriate:
1. Mail - works fine for me.
2. Safari - normally works fine and I like to be loyal to Apple.
3.
Firefox - for when Safari doesn't work fine...
4. AddressBook - nice integration with everything else
5. iTunes - music and video, plus the path to my iPods and Iphone.
6.
Handbrake - For encoding video. Can't be beat (requires VLC now)
7.
VLC - now a requirement for Handbrake. I haven't really fully used its own capabilities yet...
8.
Perian - adds support for more formats to Quicktime.
9. Quicktime - video that works.
10. iLife - Free with my iMac. I use iPhoto. There is an upgrade cost though going forward, so maybe this isn't fully "free"...
11. iChat - good for basic video chat and instant messaging
12.
Thunderbird - my wife and I use different e-mail programs. She likes this one a lot. Saves having to have multiple accounts on one computer.
13. Time Machine - nice to have a backup!
14.
DropBox - good for keeping my laptop in sync with my desktop.
15. iCal - basic calendar program.
16.
Acrobat Reader - don't you always need this?
17.
Flip4Mac WMV Player - Allows Quicktime to play Windows Media Video.
18.
MetaX - Metadata tagger for MP4 files. Let's you easily add (among other things) movie posts, chapter information, rating, actors, etc.
19.
Stuffit Expander - seamless decompression of files you download off the Internet. Perhaps not as useful as it once was, but a good standby.
I'll leave 20 blank to give me flexibility!
