If you are looking for a site for breeding bettas that conform to IBC standards, it's best to go to the IBC's own forum because many of the members here who breed bettas don't necessarily breed for show quality but rather for healthy fish and good color. IBC will have lots of good advice on breeding genetics but if you want sound breeding advice in general, we do have many good breeders here including chard56, DarkMoon17, and indjo.
In light of the recent mention of breeding however, I'd like to take this opportunity to ask members to be respectful of other breeders. It is NOT okay to criticize someone else's bettas because that person has put just as much work and love into breeding them as the next person. If you don't want your bettas criticized then act in kind and don't criticize someone else's.