Taboo indeed. usenet seems to be the last stand backup for getting
roms and you can always find the latest ones posted at least once,
and usually some reposts once in a while but hurry before the news
caches clear the b3 roms. Otherwise you'll have to use the ole
search engine to get http/ftp sites.
ArcadegHome's frontend has a good roms search engine, though. I used it to grab some NeoGeo roms but I don't know why it caught the slowest server on Earth...