Someone should really make a Metroid clone, because Metroid Classic is, well... Not there after almost a full year of development (translation: DELAYS).
I would help in any way I can.

Getting back on topic...
http://vegastrike.sourceforge.net
VegaStrike, originally a Wing Commander clone of sorts. It's a 30 meg download though, so I don't know how good it is, heh...