I just ordered a 1GB RAM module (Techworks PC4200 DDR2 SODIMM) for my PB (new 15" Albook 1.67GHz). Please advise if you happen to know whether it'll work with the 512MB SODIMM that came with the PB (=1.5GB RAM)? If it does, cool. If not, I'll just sell the 512MB module.