Depends on what you need the remote to do? i tried "off" which supposedly allows you to turn off your pc. I run windows7 and it didnt work for me.
If you have IHC in your house, you can get a remote to control all the electrics, eg lights, curtains etc. Don't own that app myself but thought I'd mention it as it sounds nifty!
If you are looking to control your itunes music library then look no further than "remote" which is an iphone app but works great on the ipad and is very cheap if I recall correctly.