Ok, I know it's old, but I figured I'd reply anyway and give some details of how mine grow. I live in Southern Ohio, and grow them outdoors, which will work just about anywhere in the US except deserts, beaches, or the extreme north.
Once you have a flytrap (there's a link to equilibrio earlier in this thread; I've also purchased from them with great satisfaction), find a spot in *full sun* for it. Now, if it's one of those sad, half-wilted traps from Home Depot or Lowe's, grown in a plastic cube, you'll need to start it out in indirect sun and gradually increase the sun exposure, but well-grown flytraps from proper carnivore nurseries will be ready for full sun immediately.
The soil mix I've had most success with has been 1:1 peat and perlite in drained plastic pots (other mixes work for others, but this is simple, easy and availible widely). The important thing is that the soil must be acidic and nutrient-free. Never, ever fertilize your trap; that will kill it. Similarly, you must be careful of water hardness; minerals can accumulate and kill the roots. Cincinnati has very hard water, so I just buy distilled water from the local grocery store. Keep the plant pot about half-submerged in water at all times.
For the whole growing season, that's it. Just get one, ensure it's in the right soil mix, place the pot in a dish, fill with distilled water, and put it in full sun. It'll catch it's own insects, and you won't have to do *anything* to it except re-fill the water; they basically keep themselves, very low-maintenance.
As Gordon indicated above, dormancy is essential. In about October or so, their growth with slow and the plant may begin to die back. Just pop it in the fridge, check occaisionally for mold, and when spring comes, put it back outside. I usually re-pot mine each spring with fresh soil, and also, if they've produced multiple sub-plants, divide them before they're out of dormancy (division can be done other times, but may shock the plant and retard growth).
So, in total summation, keep them wet, in full sun, and in the right soil, and they'll be great, easy and rewarding. Pop them in the fridge over winter, and repot for spring.
Also, north american pitcher plants (<i>Sarracenia</i>, not <i>Nepenthes</i>) can be grown by the same methods, also with great success. I've got a fair number of both, and they're thriving under this method.
Hopefully this'll answer questions in the future when other people look for info. Again, sorry for bumping such an old thread, but I thought this would be helpful.
u shall die