Metroid Galaxy - Click on "Super Metroid Galaxy" to the left.
The Metroid Chronicles - A bit confusing, but okay.
Planet Zebeth - Rated PG13, for... um... stuff.

-Of Doom :evilgrin:
P.S. I don't even know if there are any other good ones out there.

I like mine, but they aren't really, how should I say this... good.
Clicky.

Yours take too long to load, and the quality of the sprites aren't that great either.
Edit- Oh, and OD, the metroid chronicles are down, it seems.