I had a thread created about this a bit ago on fixing the resolution, and while that has been fixed, I am still not 100% on using the plasma as a computer monitor. Basically I have a 42" Panasonic plasma (P42ST30), and while I do love the TV to death, being used as a monitor presents some issues. For one, it is being used as a computer monitor only now, which means I am sitting 2' away from it, and you definitely notice the heat. I LOVE the image quality, viewing angles, impossibly quick and smooth image refresh speeds, and obviously size.
The problems I am having are again, the heat which quickly builds up in my smaller room, the screen size does lead to eye fatigue after a while, and another interesting issue is that when using it for web browsing, I notice text will get blury for a second, then sharpen back up, as if the TV is trying to process it a few times every minute to figure out what is going on. That or it is the anti-burn-in kicking in. This again leads to eye fatigue, and can be a bit annoying for computing use. For gaming and movies though, it is absolutely brilliant. Then there is the worry about burn in as well, which is what is making me look at going to a 27" monitor.
The ones I have been looking at so far have been the ASUS MX279H, VG27AH, VS278Q-P, and ASUS VG248QE. I really like the idea of a 27" as it seems it won't be such a big step down, but the VG248QE seems to get some amazing reviews. I do have a window that can cause glare, and with LCD not having as much brightness as the plasma, having a matte finished display seems hugely beneficial.
Basically I want a computer monitor to handle 60FPS gaming just fine, have good viewing angles, a really good image and bright image quality, and not be a huge bother with a window. I know it is a lot to ask for, but honestly if it wasn't for the worries about burn in, text blurring, and heat, I would just keep the plasma (mostly the first 2). Oh, and eye fatigue, but I am not sure what is leading to that yet....