Since I started symlinking (my setup below) the lag in major cities is all but gone, but I have a new problem. Ever so often everything will freeze for 2-5 seconds. This happens every once in a while and I think it may be a RAM issues.

Here's my dealio:

C:\Winders (160 GB 7200 RPM Sata2)
D:\World of Warcraft (500 GB 7200 RPM Sata2 drive) I run a full copy here. I update this one.
E:\Wow0, Wow1, Wow2, Wow3 and Wow4 (2 Raid 0 10k drives) I symlink addons, cache, data and WTF all back to D:\World of Warcraft

My 4GB is a very serious problem. Honestly, it may be enough but if I keep telling myself it isn't I can justify going to 8GB. 4GB SUCKS! Bin Laden runs 4GB of RAM!

Ok, off to NewEgg.com . . .