One thing looking at the weights on paper doesn't show is how the bikes feel.
Funny thing is my manual says that the bike without gas but otherwise ready to ride is 248 lbs. My old TT-R was 273
After AIS removal, airbox and exhaust mods... we have probably shaved 3 lbs or so. I always remove my head light and ODO so thats another 3 or 4 lbs... a full 3.1 gallon tank adds 8lbs though to the wet weight....
If you want a light bike, don't get a WR... but like JSF says the 07 "feels" 15 lbs lighter than the steel framed bikes in regard to handling with the lower center of gravity.