THIS is probably the best out there. You should try it to see if it works well on your device. I tried it on my Treo and it works ok. The programming is infinite and very nice. The IR signal strength on Treo is actually not bad at all, I can change channel or volume of my TV at about 8 feet away. The real problem for me is that the IR signal from PPC is too narrow, which means you have to aim it very accurately towards the TV IR receiver in order to work at that distance. A lot of people mistake this as weak IR strength. But overall, it is a novelty and will not completely replace your trusty remote.
Jeff