Keep in mind that it takes at LEAST a year to get martins established - so they won't help you at all this year. You may want to put up martin houses for the future AND try one of the other methods, for now. The links below might help you distinguish effective and ineffective methods.

Of course, you could employ the VERY effective method common to Florida (and hardly anywhere else): a screen house, enclosing your pool! That pretty much works immediately.

PoolDoc

PS: There is also some question about just how effective martins really are:
http://purplemartin.org/update/MosCont.html

http://www.epa.gov/pesticides/health...s/mosquito.htm

http://www.ca.uky.edu/entomology/entfacts/ef005.asp