I'd recommend the Radio Shack pyramids mentioned above. I've been using a couple of sets for about 5 years now for communicating between rooms and never had a problem. They don't really require anything except that the remote be pointed at the sending unit and the recieving unit/blaster be in line of sight of the sensor on the receiving device, or in my case devices, and they're very forgiving on both requirements.
This may be one of those rare cases where the cheapest solution works best.
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HT:
990/770
Oppo BD83SE
Pioneer Elite DV-47A
Magnavox HDMR513h DVR/DVD-R
Sony DVD megachangers-2
Sony CD megachangers-2
Monster power centers-2
Sony 48" rear projection SDTV
Roku video player
JVC AL-A158 Turntable
Polk RT-2000s,CS-650,XS-650s,RT80s
LFM-1EX
Hsu VTF-1
12" Velodyne
Family room:
OPPO 970
Sony 32" direct view HDTV
Denon 3801
Rolk RMs