Wow, I've never heard of that one (then again, aside from VLC, mplayer, Quicktime, Winamp, Real and WMP, I don't really know much about other players). This one looks rather nice. If it seems to play everything, you might also want to have VLC or/and Mplayer as back-ups/alternatives, just in case.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-