I just bought a stereo bluetooth headset (A2DP, the works), planning to use it to hear the sound from the PS3 while gaming, to avoid having to look for some long audio cable for my normal headphones.
Bad news: the headset works, BUT it is only used for voice communication; not for the actual music or sfx from games.
Which is something I had not seen mentioned anywhere, and had me chasing around for a while. I finally saw it as a side comment in some FAQ in some forum. So I hope this helps anyone before buying his/her own headset.