Fan games
http://metroidclassic.com Metroid Classic… er, SSG thingy
http://supermetroidclassic.com Super Metroid Classic
http://playmetroidonline.com Metroid mod for Halo Custom Edition
http://www.metroidgames.tk/ Metroid Games
http://metroidr.brpxqzme.net/ Metroid Fan Mission
http://mods.moddb.com/4962/metroidrevolution/ Metroid: Revolution
http://dhost.info/metroidnm/ Metroid Net Mission (Not the same)
Fan sites
http://samus.co.uk SCU
http://metroid2002.com Metroid2K2
http://phazonvandyk.proboards32.com/ Phazon HQ
http://m2sw.zophar.net/ Metroid II Secret Worlds
http://www.metroidmetal.com/ Metroid Metal
http://smproject.ocremix.org/ Relics of the Chozo Super Metroid Remix (Music)
http://mdb.classicgaming.gamespy.com/ Metroid Database
http://www.metroidguide.com/ Metroid Guide
http://metroid.homestead.com/ Metroid Evolution: Helping Retro Studio
http://s3.invisionfree.com/Metroid_Headquarters/ Metroid HeadQuarters
http://mysite.verizon.net/vze8bwp8/ Metroid Science Guide
Some sites I visited looked as if they were abandoned or just took 3 seconds to make. Enjoy!