Are you wanting to Airplay music, or video? There are quite a few AV Receivers that can airplay music/audio. The only thing I know of that can Airplay video is the Apple TV, and I think it might stay that way for a while, I haven't heard anything about Apple licensing that to anyone.
Yeah I think I had thought that apple had licensed both audio and video, I didn't realize it was only video. Pretty stupid considering the other technologies that are coming out from other companies. I do love airplay though, it works perfect for me almost every time with no effort.