What kind of case does your HTPC have? What OS are you using?
Soundgraph has some that will turn on some PCs and they even have a RF remote. Your computer must be able to wake up on USB activity for the Imon to turn it on and you must get the right model of Imon for it to turn on your computer. Yes the Imon will control your cursor but it will not work like the Gyration does. I am very happy with my Imon remote and I like the fact that it does turn on my HTPC but I wish I had the RF remote.