Its running beautifully actually, no problems whatsoever. I did have some trouble when I updated my network drivers, they simply didn't work after installing them so I just rolled them back and stopped fiddling with it. I also had ESET Nod32 v.3 installed and Windows 7 didn't like that but v.4 was available so that fixed that. Though soon as I get a DVDR to burn to I can install the 64 bit version, which are you running?
I am using the 64-bit version.
I thought maybe it was Kaspersky Anti-virus that was causing the problem. Back when Windows 7 Beta 1 came out (I also ran it in a VMware virtual machine), I tried installing the technical preview of Kaspersky but it would completely lock up during the install and any subsequent boot. It installs okay in the release candidate, but I thought maybe it still had issues so I uninstalled Kaspersky last night; however, the vm kept locking up when I was trying to view the Event Viewer after the VPN client's installation would fail without a displayed error. Now I'm wondering if it is the VMware Tools (a set of video and mouse drivers, plus some other stuff).
I just ordered a new hard drive yesterday to run Windows 7 without blowing away my Vista installation. (It's amazing that 500 GB and 640 GB hard drives are only like $10 - 15 more than 160 GB hard drives.) I wonder how many of my devices I'll be able to get working when I install it on a real machine. It seems that since Windows 7 is pre-release, a lot of software and hardware vendors aren't in a hurry to make available anything that supports Windows 7 (or if they do suport it, they don't say so). In any case I hope the issues I'm having are just vm-related.
That's what I thought too! I thought it was upsidedown 
Now that I have thought about it PSUs would be so much more convenient at the base! The power cords could slide in to the bottom and not dangle over everything else from the top. I don't know how the heat would affect it the rest of the system though, since heat rises, and the PSU would likely be the part to generate the most heat by itself.
That's nothing.
My case has the PSU on the bottom and in the front.. Reverse airflow. It is actually a pretty poor airflow design because the upper rear gets nothing but a couple of vents.
Edit: Actually, 500 - 640 GB drives are only $5 more than 160 GB drives if you go with the 16 MB cache. I went with the 32 MB cache.