I've been focusing on building links for about 5 months now, and recently had about 49000 links in yahoo and about 16000 in altavista. But recently (last 2 weeks) the links have been gradually dropping away and i now have about 25000 in yahoo and 1690 in altavista!! My question is why have so many links been neglected, does altavista count links in a different way to yahoo? And which is the most reliable or sources for backlinks? Any info on this would be great. thanks in advance.