MAME:
http://www.mame.net/
http://www.mameworld.net/
http://www.emulator-zone.com/doc.php/arcade/mame.html

Play MAME Online:
http://www.kaillera.com/download.php
http://ggpo.net/

Arcade  Cabinet:
http://www.jarvisweb.net/MAME/mame.htm
http://www.arcadecab.com/
http://arcadecontrols.com/
http://www.arcadeathome.com/pics.phtml
http://www.koenigs.dk/mame/eng

ROMs:
http://www.romnation.net/srv/roms/mame.html
http://romhustler.net/roms/mame
http://www.coolrom.com/roms/mame/
http://doperoms.com/

Arcade Room:
Arcade Room decore by Nice Carvings!

Cool Sites:
Awesome pac-man site with lots of free stuff!
Download old DOS games here!
More DOS games here!
Online Video Game Museum.
MAME Addicts online storage.