Fungus gnats are indeed pesky. Sooby gave great advice about letting soil surface dry between waterings to thwart the adult gnats.
For those of you interested in another type of gnat control, try some tropical/Mexican butterworts (Pinguicula sp.). They grow attractive rosettes of sticky leaves which attract and trap gnats like a magnet. They also have attractive flowers, do well under fluorescent lights or on windowsills, and are extremely easy to grow. Much better than the yellow paper glue traps!
