I would say fungal gnats. The best stuff is gnatrol here is the number for their company. Give them a call and find a distributor in your area or order some over the Internet. They are more of a nuisance then a problem but getting rid of them is always a good thing. The larva lives in your soil and every time you water they only feed more. They do eat roots but I have yet to ever have them hurt any of my plants. I just don't like the idea of bugs in my rooms.
1-800-89-VALENT for distrubutors