Links
Here are some links I would recomend for you, along with reasons.
forums
live fooduk - A good forum for discussions on reptiles, amphibians, invertebrates, and general exotics.
Arachnoboards - This forum is second to none for information on invertebrates. Although it is spider heavy, you will always get an answer on whatever species of invertebtrate your interested in, you just have to be patient. A tip, the people on here tire of people having the same questions over and over again, so I would recomend using the search feature, and if you can't find an answer then making a new thread.
Pet suppliers
TheSpiderShop.co.uk : Invertebrate/equipment Suppliers
This company is simply brilliant. The livestock is healthy, postage is quick, the prices are good and the owner is a nice chap. What more can you ask for?
Other/Link exchange
The Bts - If your into tarantulas, this is the club for you!