Slowdown, all processes to CPU?

For the last 2 weeks my MBP has been really slow, even with the 10.5.2 update. I've also noticed that my RAM is always at a "stable" level, and that it never spikes as it used to, but my CPU has been constantly spiking. The processes that are really hitting hard are Windowserver and iTunes (when its on). My habits haven't changed, I havent been doing anything different.

I have a 2.6Ghz MBP, 4gb of ram. Is it possible that a portion of my ram failed? Is there a way to find this out, or to test out the ram itself?

Even with everything off (including Safari, iTunes), I notice that my CPU levels are still spiking, my dock is still stuttering when it comes out from auto-hide, all genie effects stutter a frame or two...its just all very clumsy.

My HDD still has 70GB left, out of 200GB. I only have 500 songs in my iTunes, when I had 3,000 songs on my PPC Powerbook, it ran fine..and it only had 512MB Ram. I've restarted multiple times, left it off for a whole day even.

I will try resetting my PRAM when I get home in an hour, does anyone know how to do that? Is there anything I can do? Should I order new ram?

I would use onyX for some "spring cleaning". The second link is for some "suggested maintenance".
http://www.macupdate.com/info.php/id/11582
http://www.thexlab.com/faqs/maintainingmacosx.html#Anchor-Recommended-49575

You can try the Apple Hardware test to check the Ram.
http://www.thexlab.com/faqs/aht.html

Thanks SoulWar, but none of that helped.

Im looking at my ram guage (from istat) and it isnt moving AT ALL! i have multiple programs on. No "Swaps", no "Page Outs" do i have bad ram, guys?

Check how much inactive, free, and used RAM you have by going to the Activity monitor, and then selecting System Memory, it'll show you a complete breakdown.
Check System Profiler as well. What status does it give for the ram?

The one on top is my ram, the one on the bottom is my CPU. Notice that my RAM is spiking up and down, when the only thing i have on is Safari. And notice that my RAM is not doing a thing. I did memtest and it said my ram is fine.