From: Kindra Ling
Is there any difference between them, or is it just that one costs more than the other?
The difference is not just the money, no. You do get what you pay for. Photoshop is the most powerful, most full featured, and most universally standard image editor on the planet. It has loads of features that Paintshop Pro does not. PSP is a fine program too, though. It's more than adequate.
The quickest way to boil it down is this. If you want the best program you can possibly get, it's Photoshop, hands down. But if you want a program that costs less upfront but is still good, PSP gives you the most bang for the buck in its price range. Neither of those descriptions probably means much to you right now, though, since as you said, you've never used a graphics program before at all. People could make all the arguments in the world in favor of one or the other (and I'm sure they will), but you're not yet capable of really understanding what they'd be talking about. You need some experience before you can can know.
Here' what I'd suggest. Dowlaod the 30 day free trial of Photoshop from adobe.com. Spend the next month learning everything you can about using it. Invest in a good book, follow as many tutorials as you can, maybe even take a class if you can. 30 days is not much time, but at least it's something. Commit yourself to learning Photoshop well, and you'll develop an understanding of certain principles of graphics that you'll then be able to apply to lots of other programs, including PSP.
When it gets toward the end of your trial, say day 25 or so, downlaod the trial for PSP, and give it a whirl. You'll find that much of it is similar enough that you'll be able to transition pretty quickly. But you'll also find that a lot of things are missing.
Spend the next few days considering carefully. Now that you've learned enough to understand the differences, at least to a degree, are the missing features in PSP worth the initially lower price? Remember, time is money, and you can recover the higher upfront cost of Photoshop fairly quickly if you put it to good use. But if you're only planning on using it very casually, then PSP might well be the better choice for you. Only you will be able to say what's best for you. The important thing is that you've educated yourself well enough to make an informed decision from experience, not just from the opinions of others.
I would not recommend going the other way around, by the way. It won't work as well to start with PSP and then move up to Photoshop, not when all you have for experience is 30 days. By learning Photoshop first, you will have developed a knowledge of 2D graphics principles that surpasses PSP's toolset. You'll then be a in a good position to appraise the relative values of the tools in both programs. But were you to start with PSP first, you wouldn't learn as much, since you wouldn't be exposed to as much. Because PSP doesn't have as many features, it forces the user to approach certain things in roundabout ways instead of head on. This can make for a distorted initial understanding of what's really happening. At that point, when you try Photoshop, you'll most likely keep right on using those same roundabout methods, even though you don't need them, and you won't as readily grasp the differences between the two programs.
In other words, there's nothing PSP can do that Photoshop can't. But there is a lot that Photoshop can do that PSP can't. And for a lot of things, Photoshop will do it in a much more direct, and more deeply understandable, way. It makes sense to learn the one that can do the most first if you truly want to understand the differences. Run Photoshop through the mill for a month, then give PSP a go, and then make your decision.
By the way, even though you didn't ask about it, I'm sure the GIMP fans will throw their 2 cents in here too about why GIMP would be a good choice for you too. As I usually say, GIMP is a good program, suffering from a bad interface. I don't recommend people start with it, as it's kind of an oddball. The habits you'd pick up from it won't be as well applicable to other programs as would be those you'd gain from Photoshop. When you're brand new to any subject, I think it always makes sense to start with whatever will to teach you the most universally applicable principles. In this case, that happens to be Photoshop.
That said, GIMP is free, so if you want to try it out, it's easy enough to get hold of it. I find its interface to be very, very frustrating, but that doesn't mean you necessarily won't like it. A high percentage of the people who do like it tend to be engineering types, programmers, and such. To hear most of them tell it, the interface couldn't be better. If your personality leans that direction, you might well love GIMP. Mine doesn't, and I don't.
From: Kindra Ling
I did notice that there are a lot of different types of Photo Shop available and wasn't sure which one I would need.
This is where Adobe really drops the ball in their business model. Because Photoshop is their flagship product, the one with the most recognizable name, they slap that name onto products that have nothing to do with Photoshop itself. The only one that is actually Photoshop is called simply Photoshop. Photoshop Elements is not Photoshop. Photoshop Lightroom is not Photoshop. Photoshop Album is not Photoshop. Don't waste your money on any of those things.
The latest version of Photoshop is called Photoshop CS3. Within that, there are two editions, the regular one and the extended one. The extended one comes with some extra features for animation, video, and 3D. For SL stuff, the extended version's 3D capabilities are handy. You can paint on the clothing templates and then see the results on the 3D avatar model. It saves a lot of time.
From: Kindra Ling
Do they all work with Vista?
All Adobe programs for Windows that came out in the last couple of years will work with Vista.