Crucial, Corsair, + Mushkin DDR Shootout
 

8-Balls Hardware has just finished up a great comparision of three major DDR manufacturers' DDR chips. Here is a snippit:

Memory has got to be one of the most important parts of a computer system. In recent days, the big names in memory manufacturers / resellers have been quick to introduce their own version of DDR400 memory, or otherwise known as PC3200 DDR memory, which of course, also happen to cost quite a bit more. We check out some Corsair XMS 3200, the very new Corsair XMS 3500, some Crucial PC2700, Mushkin PC3200 as well as throwing the Crucial PC2100 into the mix.

Read more at 8-Ball

I have a stick of 512mb PC3500 xms from corsair, best ram I have owned to date, running the most aggressive timing settings I can select and runs like a champ :)