I have been using a gyration wireless mouse and keyboard for my HTPC. A few of the keys on the KB are dead (ones I need for my PW) so I thought this might be a good time to see if there are solutions with HTPCs in mind.
There are many, from the full sized Logitech dinovo, to compact laptop sized like the Cherry g86 bluetooth, to the remote control sized Rii mini. Also if you happen to have an iPhone, or android device, you can use one of those as an htpc remote.
I think I want to stick with a physical keyboard. The one I'm replacing is laptop sized and worked pretty well in terms of size. I was looking for something to type with as I need to enter text just enough to make a keyboard worth the effort