How to create one clean image from multiple shots?

Question

I tried searching, but I really don't know how to search for this so I came up empty.
I have multiple pictures of the same product but had to focus on different parts to get those parts in focus. As you can imagine, this meant other parts were out of focus.
I seem to remember during one of the "CS3 is cool" seminars I attended that something along the lines of what I'm hoping to do is possible.
I would like to merge these images together to form one image with everything in focus. Exposure is the same on each of them.
Is this possible (and if so, how) or am I dreaming?
Using PS Extended.

Answer 1

Thanks for all the suggestions, guys. I'll give those a shot and see if they work enough. If it looks like it'll take too long right now, I'll just try to find a better angle where I can get it "good enough" as I have many more pictures I need to take of cables and wires.
Super fun.
To answer some of the questions posed to me:
I looked at photomerge, but that looked to me like more of a way to make panaramic (sp?) pictures from multiple shots. I may tinker with that a bit though as it's something I'd like to use for other things as well.
I don't need this very often so this would not be a common practice, but if I knew how to do it, that would open some more options for me and I'd likely do it more often but still not regularly.
It's not a super closeup, though I've had need of this operation on those in the past; wound up just shooting differently and settling for second or third best.
I don't use what anyone would call a photo studio. It's a 4x8' piece of styrene tacked to the wall and a fold-up 6' table in a room with flourescent lighting (please try to restrain your laughter). The company's camera, while decent, is very old: Sony DSC-D770. This is why I bought my own Sony DSC-F828 2-3 years ago. Not the best but much better (the tiny-to-sometimes-larger purple haze around most edges is what bugs me the most). And my setup is just my camera on a tripod. I'm not fooling myself about my skills at photography; I'm very small-time, but I still need my shots to look good.
(Out of respect for actual photgraphers, I don't even call myself a photographer. I "shoot product photos" or "do product photography" which still sounds a bit too lofty, but....)
The product itself is the Velleman TLM12, a test tweezer for SMD devices. I'd like to get a "long" shot of it but that angle makes the tip and leads get out of focus in most shots and they're tiny so it's really noticable. I can get every part in sharp focus in 3-4 shots, but not in one at the angle I'm hoping to get.
I use a macro lense when I need to get big pictures of 1" connectors and the sort, but this is way too big for that and the macro has a very small area of what would be in focus so this problem would be compounded far more than I'm experiencing now.
I think layer masks might be the quickest way to achieve what I'm trying for here. Like I said, I don't need this often but if I knew how, I'd do it more frequently and might even create an action to do this faster.
Thanks again, everybody. HUGE help. :)