I was looking into to this recently as an older friend has thousands of slides lying around. After a bunch of research, it would seem that the Wolverine brand of slide scanners seem to be fairly easy and quick to use as they just scan right onto a SD card and done.
Short of spending the big bucks they also seemed to be the best over all reviewed. Several photo blogs and review sights also recommended them. Apparently, that extra 80 bucks is worth it to get better clarity, increased mega pixles, etc etc.
The one thing that I kept reading about was that most people will buy one of these scanners for digital storage, but the ones they really care about or the ones that they want to blow up, they send off to a professional service. It would seem that some places will do it for a dollar a slide, some more, some less depending on how good you want it to be