As in you're wanting to know what you can sell those parts for? Or you're wanting to buy newer replacement parts, and want to know what you can get?
If you're trying to sell the parts, I'd check ebay, and see what they're going for. They're definitely old, limited parts, and I wouldn't expect you could get much, but when it comes to computer parts, ebay often proves me very wrong - I'm amazed at how much stuff goes for there.
As for replacing those parts, I'd need to do more research than I have energy for right now.
If your system is socket A, you could probably get a 2+GHz processor for 25 to 50 bucks on ebay - if that's what you really want to do, it's doable, but you'd need to make sure your motherboard supports it. I've got an old throw-away system in my basement that I had to overclock to hit less than the rated speed, because the motherboard has a slower FSB than the chip has at stock speeds.
So yeah, you can upgrade that system - if you want moderate improvements for $100 or so, you can do it. If you're willing to invest $500ish, you can come away with a far better computer though.
People are asking lots of questions LL only cuz there's a wide range of choices out there and you didn't give people lots of basic info about your needs so a good option can be offered to you.
Offhand, if you kept your PC that long, I'd say you aren't a big PC gamer (new games), and you use your PC mainly for surfing the net and doing regular basic stuff. You don't need an expensive powerful PC for that, but if you want to future-proof yourself a bit because you like to keep your PC for awhile, you also don't want to get a box that is too cheap that will require upgrading soon.
If you have an idea what your budget is, how much your willing to spend to get something half decent, then that would give the boys here a better idea what to suggest to give you a good bang for the buck machine. You could add whether you want to stay with AMD or don't care if it is an Intel or AMD platform.
Right now my biggest suggestion would be to get a decent 24 inch screen when you purchase (if you also want/need a monitor). The extra screen size real estate is really nice and really worth it. I guarantee you won't regret it, ever.
You can reuse your old case if you want to save money. The motherboard also has an IDE port, so you COULD use your current hard drive and DVD drive, but I recommend new ones. Those prices are rounded to the nearest dollar, they are not sale prices, and they are before tax and shipping. You may be able to find some of those things cheaper if you look for sales, but they are decent prices. Hope that helps. If you're just writing and surfing, you do not need much of a computer. Add a video card and this one would even be fine for gaming. Oh, I didn't include an operating system either.
Also, my sympathy on the broken hand. I busted mine a couple of times... typing isn't a problem, but hand writing for more than a few minutes causes a lot of pain.
Do you want to spend as little as possible? Or do you want us to suggest something a lot closer to the $1000? Is it just writing and surfing you're doing... maybe some video? If so, what I suggested will do that just fine - but if you want better, it's quite doable - $1000 can make a pretty solid computer.