Give them a chance to self promote

Tell people you are building a resource list and ask if they could contribute any relevant sites, even ones that they own.



That is true, but make sure that whoever you ask is not a parasite, because once a parasite gets wind of it, he will pass it on to his parasite friends and next thing you know you have 10 spammy comments and real commenters will not want to be caught in the middle of that.