Pretty much all TVs overscan.

I'm not sure if you were asking me or not, but I'll give my input anyway, heh. I've only connected a PC system to two CRT monitors, so I don't have experience with a Mac and an external monitor (not hooking one up, anyway, though I have worked with them before). Connecting the monitors was easy enough, but that's different, since they're made for the video card on a computer. I'd imagine a TV's a bit different, but I'm not really sure (gee, a lot of help that was).

Ditto on what miahz said, as that's what I've done. I am curious, though, have you found that the image on your HDTV is cut off on any of the edges? I have found that the top and bottom 20 pixels (roughly) get cut off, so I don't see the top and bottom edges on the HDTV. It may be just my TV (Vizio) so I wanted to see what your experience has been (regular CRT or LCD monitors connected to my MacBook Pro don't do this).

That's pretty sweet.  I saw that somewhere recently, it looks pretty awesome.  I spend tons of time in front of the computer each day too, but I'm pretty happy with my MacBook for now, heh.  It's plenty portable.  But I can see how something portable like that would be nice for doing video editing for long stretches of time, since you're typically obligated to keep going to meet a deadline, but the office gets uncomfortable after a while.  Congrats, looks pretty sweet.  I'm also admiring the MacBook Air recently, which looks pretty incredible.

You don't have to get a wireless-enabled Mac keyboard, you can use any keyboard with a Mac computer, it's just weird to be pushing the Windows key when you're looking for the Command key.  I guess, though, the price you're referring to is due to the wireless capability and not the fact that it comes from Apple (though they are typically pretty expensive).  But now, after reading the comments above, I guess you've already got it figured out.  For some reason I'd pictured you wanting to be somewhere far away from the computer (other side of the room, for example) but still using the computer with the bigger screen... thus the wireless keyboard and mouse.  But never mind... you've got it.  And yea, having two screens rocks pretty sweetly, it's a tiny bit awkward, but not that much.  I do video editing and visual effects and I was working with two screens for a while before I moved, and it was a fun thing to play around with.  That and the Wacom tablet had me buzzing with excitement.  (If you do a lot of Photoshop stuff, particularly drawing, I'd recommend using a Wacom tablet.  It's weird to get used to, but it's supposed to be more natural feeling that drawing with a mouse... I'm so used to the mouse that the tablet's still weird for me.  But it's fun to play around with).

Yeah, if you're talking about Photoshop and video editing, then what you want is more screen real estate, not just another view of what's on your laptop display.  If your LCD supports higher resolutions (HD) using the HDMI connection, a cable might be worth it if you end up with more resolution.  If 1024x768 is its native resolution, stick with what you got.

Don't buy anything.  Just set up the DVI/VGA adapter output as a second display (instead of mirroring your laptop display) and set the resolution to what your TV needs.  Check the Display System Preferences.