In looking at the posts here, both in the forum search and through browsing posts, I see that quite a few people are getting wireless keyboards that have a separate mouse. In the WIKI I think it was, there are links to various keyboards like this:

http://www.directron.com/ack581.html

I am looking for one that is wireless PS2 and has a built in mouse/ trackball/ whatever. I will definitely need the mouse as a part of the keyboard. Is this what you guys are using or is there something "better"? I have most all the parts ordered but the input device. I really don't NEED a HTPC, but this looks too fun to pass up!

That's what I'm using, and I'm very happy with it. Inexpensive, small, reliable, fairly rugged, no glitches, good range, no special setup, no unplugging/replugging to get it recognized, ...

Got it.
Love it.
Plugs in via PS/2 jacks, so it'll work with ANY PC built since 1995 or so!
And it's cheap.
You won't love the mouse, but it's fine.

Thank You for the replies. I'm assuming you don't use the thing much anyway, as the main control is the remote that will come with the HAUPPAUGE WINTV-PVR 350 like a regular entertainmet component.

I actually tend to use the keyboard more than the remote. It's easier to do certain things with it. The comments about the "mouse" match my experience. On the other hand I've always hated the ThinkPad style pencil eraser "joysticks" which a lot of people swear by, and it's very much like that.