Seriously, cscott, my advice to you is to do a search with the search engine (the magnifying glass at the top of the page), and read, read, read. You will be glad you did. I spent more time reading this site than I did doing my job when I first found out that I was losing my hair. And reading up on HM should be... dare I say hopeful.
In short, they extrack hair follicle cells from the back or sides of yours scalp, where the hair pretty much never balds on anybody, and they cultivate those cells that are immune to hair loss, multiply them many times over (a million, according to one of the Intercytex link's statements), and reinject those new cells into the scalp where you are going bald, in hopes of growing hair there.
Read up. It's worth it.