I like Weatherspotters list.
With a diesel, the kill switch has less benefit. Some (myself included) feel it is worse due to the startup fuel diesels use, YMMV.
I would think the roof rack delete would be a quick easy one ?
Piwosaw (sp? Theres an L in there) has a nice wagon as well. He's from your side of the pond with a Pugeot. Ya'll get all the good toys.
Have you found
Fred's TDI Page. TDIClub.com. VW TDI Enthusiast Community ? They have goot tips in their FAQ section.
Remember, with a diesel, performance mods dont use more juice, if you stay off the RT pedal that is !