I hook my PC up to the TV system in my house on occasion, pretty simple once you have all of the stuff to do it. I've got a Radeon X1900 XTX, and I use the S-Vid out and pump it into the TV. I've got an adapter to do component, but it's a PITA since all of my component jacks are used. The S-Vid's max resolution is 1024x768. Sounds bad? Well, it can be. Not sure if I'm preaching to the choir and you know this, but I'll go into it. If you're at desktop, or trying to surf, this may not be what you're interested in, and getting one of those USB PC>TV kits may be what you want. If you're looking to game or watching movies on your TV, it works fine. I watching movies on Media Player and setting it to full-screen mode pretty much makes it a big monitor, and the low resolution means nothing at that point. Nothing. As for games, MMOs would probably be annoying since the chat would be hard to read. Characters, guns, and all of the rest of it just look a lot bigger, and there's no real problem with seeing anything. You won't be able to pump 1600x1200 resolution through the game, but I'm happy with it. It's preference. If you've got a plasma, I'd bet that you have DVI inputs on it, and I'm quite positive you won't have the same resolution problems I do.
As for audio, I have a Denon AVR-3806 linking up with Infinity speakers ($1,000 a pop) and a boston acoustics subwoofer. Added with a Toshiba 65" HDTV. There's nothing negative I can say about any of the products I've got, except maybe my subwoofer doesn't knock things off the walls like my Logitech Z-5500s do. That's a brand thing though, as BA subs tend not to put out a huge ammount of bass. Playing BF2, WoW, EQ2, EvE, and any of the other graphic intensive games (WoW not really counting) on the TV is nice. Beautiful, infact. I picked up a $10 cable at Best Buy that connects the sound card to the amp directly so I wouldn't have to use any strange adapters.
In the past I've used Yamaha and Sony amps. I really can't say anything negative about the Sony amp, but I can't say anything positive about it either, as I can the Denon. It's simply an "Amp". The Yamaha, on the otherhand, was horrid. I had problems from day one. Backlights burning out, channels stopped being separated, and so on. After a year of constant service, I had my fun smashing it and bought a Denon, which was the "previous generation" of the one I have now. Aside from not being able to take the volume past 2/3 with the definate risk of blowing the fuse (Which may be due to the expensive speakers and the fact it couldn't push that much power?) I was extremely pleased. I've still got it. I'm not sure what the specs are, but the model number is Avc 3000.
Not sure if that response helps at all, though I hope it does.
Edited, Sep 3rd 2006 at 8:43pm EDT by GreatBadger