a) 1. Picky high-maintenance clients that change or add requirements midstream 2. Clients who don't pay on time 3. My own issues with estimating and managing

a) 1. Picky high-maintenance clients that change or add requirements midstream 2. Clients who don't pay on time 3. My own issues with estimating and managing time 4. Finding quality clients 5. Finding ethically appropriate projects – I've been roped into religion-oriented work unwittingly as a subcontractor far too often. b) Craigslist is consistently the best, because Craigslist is just a thin technology layer over real people talking to each other. The barriers to entry and restrictions that come with oDesk and elance are more than I have time to deal with (I'm also a full time student). c) I get direct referrals sometimes, but right now, my best bet is new clients. Also, is there some kind of filtering mechanism on your site? That would be nice.