Here are some useful links relating to NSR's...

Bike Chat Forums - BCF is a site spawned from the original NSR chat forum.

Powersport Tech Forum - Quite a lot of questions relating to de-restricting NSR's.

Joonas' Site - Some good info on the NSR

Nev's NSR125 Page - A fairly new site with some very good information.

Moto Rama - A detailed link portal for all kinds of bikes.

Ben's 125cc Sportsbikes Page - Info on various 125cc sports bikes including the NSR.

NSR Message Board - General discussions about the NSR, some about de-restriction.

On Your Bike 2000 - A site based in Jersey.

Alex's 125 Street Racers - Info on tuning the NSR plus some stuff on the RS125.