Whenever there is a question I need answered (What ingredients do I need for a particular potion/essence/item? Where can I find a particular monster? Is there a map of this area?), my first, and only stop, is the CEL site.
User friendly, good art work, a lot of information logically organised - very useful. It has made my gaming experience more enjoyable, and not just mine judging from the other posts here - which therefore makes it a very worthwhile addition to the EL community!