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cosmin..

usually we can see drosophils hovering on rotten fruit (grapefruits, for example is great to find them). A good cup of wine is excellent to attract them. :) The famous Oporto wine is great to call them. :) And myself too. :)
Mushrooms, bracket fungi, rotting organic matter are great to attract them. Usually I found them in shadowy places.

As you know Drosophilidae has a species that has a BIG importance on genetics. You know which species I'm refering. ;) I recommend for those who loves flies the reading of this book:
Fly: An Experimental Life by Martin Brookes -
http://www.amazon.co.uk/Fly-Experimental-Life-Martin-Brookes/dp/0297645897/ref=sr_1_2/202-9513541-4592669?ie=UTF8&s=books&qid=1189800490&sr=8-2
it is about some Drosophilidae flies, specially one. ;)
If you like a lot of Drosophilidae flies THE BEST place to see the biodiversity of them is in HAWAII. ;)