How do you play HD-movies?

MPC + HC with EVR -CP, LAV , Reclock + SVP + shader and connect it via hdmi to HDTV

imation media hdd pro
and watching on LED TV ;)

VLC is my best player..

I use VLC player, MPC-HC with Codec Pack

I actually stream my content to my TV using my PS3 most of the time (using TVersity as a server, any good free/cheap alternatives BTW, still using the "old" free version), when I have problems I switch to XBMC running on my Netbook with HDMI output.

Eventually I will probably build myself a HTPC+NAS and would be running XBMC exclusively.

VLC or MPC-HC coupled with DVDFab Passkey

Vlc... :)

KMPlayer + Real Alternative + Klite Codec Pack

VLC, the best, isn't it ?

I use VLC ;)