Intel iMac randomly relaunching Finder. RAM problem?

Several months ago I bought a new 3.06 GHz Intel iMac with 2GB of RAM. I also bought CS4 so I maxed out my RAM at 4GB with a 2x2GB RAM kit from Other World Computing.
I've noticed in the lately that everything will suddenly hang, the Dock won't appear when I cursor to the bottom, and then my desktop pic will change. I have my prefs set to choose a random one each day but this isn't happening at the right time, it's random. Not only that but if I open Dashboard after that it has to reload all of my widgets again. Plus any docked Finder or app windows pop back out to the desktop. It's like the Finder is being relaunched or something.
I'm wondering if this could be an issue with bad RAM or not having enough. With email, browser, FTP, time logger, and a few smaller apps going I can never really have more than a couple of the CS4 apps open without things getting sluggish. I try to avoid having more than 2 open at any one time. I've even dropped Photoshop's RAM usage settings from 70% to 60% to see if it makes any difference.
The problem is still happening and it seems to be happening more frequently. Things just relaunched and I went into Mail to minimize an email window. As soon as I clicked the yellow button things hanged again but not in the same way. No windows would minimize, the Dock wouldn't appear and I couldn't switch Spaces. When I went to restart, as soon as my cursor rolled over the Dock item in the Apple menu it stalled there for a short time before I was able to go down to restart. Then the restart sequence stalled and I had to force a shut down.
This is really frustrating as I was expecting a great new machine and software to replace my aging PowerMac G4 and older apps. Is there a way to test for bad RAM or does this sound like a known issue with CS4 or iMacs in general? I don't have the original 2x1GB RAM sticks any more, I sold them after installing my new RAM.
Any help would be greatly appreciated.

I've been trying a few things here and there when I've had time, giving time in between to see if the problem reoccurs. So far I've done the following:
1. Repaired Permissions. No effect.
2. Used Onyx to clean the System, User and Font cache options listed by default. It also told me that S.M.A.R.T., startup volume, Permissions and Prefs are all ok. No effect.
3. I removed the RAM, inspected the boards and the slots. Can't see any sort of damage to either. I replaced the boards but swapped slots. Both boards are firmly seated. Also no effect.
I'm going to try running 1 board at a time, swapping slots if the problem continues. If it does I'll try creating a 2nd admin account and go from there.
I've also noticed at times when the hang happens it seems to be when I click on an item in my Dock (usually a folder of items). There have also been times that after it happens I'll switch to another space and the windows for different apps will have disappeared. The apps are still open but if I try choosing the missing window under View or Window they still won't appear. Same goes with trying to use Show All under the Finder menu.

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