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- Playing music, equalizing, etc...
iTunes (i'll use a hardware EQ in the car if I decide I need one)
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- Watching DVDs/avi/mpg/etc..
I don't watch DVDs on my Mac, that's what I have a big TV for

Quicktime otherwise.
Safari, then FireFox, now moving back to Safari.
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- Locating unsecure hotspots
MacStumbler
There is another, but my PB is at home.
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- Any other relevant applications you use regularly.
AdiumX for AIM
Mail.app for email
XCode for Mac related development
Eclipse for non-Mac (job) related development
X11 for all those handy open source Unix GUI apps.
DesktopManager for increasing working space.
MenuMeters for monitoring system resources in the menu bar.
(The last two are by far the most useful apps I have ever found for any OS that I have used).
-dave