ok you downloaded the movie, ready to play it.. what are you going to use to play it?
Tough uh?
what is your favourite media player and why?

Personnally my choice is VLC (videolan) http://www.videolan.org/
- fast and reliable...
- need less ressources than windows media player
- Can play most media files include streaming / DVD / VCD / CD / etc
- can read partially downloaded file without damaging it.
- read subtitles without a separate codec
- jump bad frames without stopping the movie
- free

Next is Zoom player
http://www.inmatrix.com/
Visit website for details
There is a codec pack available on internet (kazAa lite codec pack)
very complete in case you have problems with some codecs
http://www.k-litecodecpack.com/