I am not an expert and there are so many approches with different compatiblies.
But girder does work with the cm15a so netremote should as well. I used girder but not netremote so cannot be 100% sure. I don't know much about promixis' attempt there, but I believe they are working on a "real" iPhone solution, which implies that what they have now is not that great. But again not sure. They have a board that could help. I did not find girder to be too impressive so I started looking elsewhere.
Most of them have trial versions so you can give it a shot. Would be curious to see how things pan out.
Homeseer looks good and works with everything you have. I can't seem to hold the connection though.
Mainlobby and cqc look to have solutions soon. I believe the cqc app is being submitted soon.
Oh yeah. One more app I am following is called irule which is to be out soon. It is really intended as a remote control but you can use it to send ir to the x10 ir unit, I forget the name.
But homeseer has things like 2 way communication with iTunes so you can see songs and all. Does weather, etc. Way more powerful than just simple on/off stuff. I found custom ones like hstouch to be pretty amazing.