When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Check out romraider and their associated forums - lots of very useful stuff on there.
As above - Ecuexplorer and if you want a quick way of checking the FLKC tables and the CEL codes then there's an app called 'learning view' on the RomRaider forums.