Crested Gecko Network — Friendly community, lots of cute crestie pics, but plenty of good information too.
Geckos Unlimited — Great community of knowledgeable gecko people. If you have questions that ReptiFiles doesn’t answer, give these guys a try. Reading through past threads is also an excellent way to do additional research on your new pet.
Moon Valley Reptiles — Everything you could possibly want to know about crested geckos, right here.
Pangea Reptile — Explanation of the metabolic relationship between calcium, phosphorous, and vitamin D3.