http://www.bug-bits.freeserve.co.uk/ramva/#home 

This is probably one of the best VW explained pages I have come across. I haven't visited all the links yet as I only stumbled across it this morning but all the info it has is fairly detailed and easy to read.

Have a look for yourself and if you know other add it to the AVD's links page.

Thanks Bronze, I have added this to my favorites, I think everyone should the info is brilliant.
Cheers
Dave