Seeing text on a TV
To solve the whole resolution problem you'll want to enable Zooming. It's in the System Preferences, under "Universal Access" (although it might move in Tiger, it'll be easy to find by using Spotlight). What does this do? By holding down a keyboard combination you can literally zoom the screen, enlarging everything. Some parts will fall off the screen, but by moving the mouse you can move the focus, and see everything.
It's a cool trick, and always makes my Wintel friends jealous! You can also see a sample of this in my video tutorial on exporting cross-platform movies (meaning no QuickTime required) in iMovie 4 here (for now):
Exporting non-QuickTime content in iMovie 4