mamestuff.lowtrucks.net — Some cool addons from Abelenki, including compiling scripts.

romulus.dats.site — A Rom-Manager that is worth to try.

romcenter.com — Another very good ROM-manager

progettosnaps.net — Best place to get all the addons for MAME. Tons of pics and manual available.

mamedev.emulab.it — One of the best rommanager available on the world

mameguide.info — A very useful tool for creating MAME dat files. Full, rollback or update dats are very easy to generate. Use the created dats with a rommanager.