Hi there,
I got my parents this
Xebec iTouchpad Diamond Series wireless keyboard (with trackpad) for their new HTPC this week and they are very happy with it.
Here is a review.
That said, I use the logitech Di Novo mini a lot for HTPC uses and it is a fantastic little device (not much bigger than a standard remote, a hinged cover keeps it clean/un-crushed, it has a media control mode, long lasting rechargable batteries and it looks cool). The only complaints are that the keyboard isn't really made for much typing and the price is high.