Just in case a former discussion will help. Please read http://forums.cnet.com/5208-7587_102-0.html?forumID=69&threadID=318697&messageID=2919672&tag=forums06;forum-threads
I feel that such upgrades are worth it to a point. Even at 200 bucks it is likely worth it if it gets you another year before you replace the laptop.
I'm looking at buying a laptop who's basic Chip is the Intel Core 2 Duo 5800(2.0GHz/800MHz FSB/2mb Cache). I'm using several web based applications and Office Professional products. Does it make any sense in my case to upgrade the chip for $150-$200 or is it a waste of money?