i'm working with silver right now with my pendants i'm making.
(
see sterling silver penguin thread)
as far as PMC goes, i've been looking into it for a while. it's available through a catalog i have at the jewelry store i work in. it looks really fun to work with, and i love the fact that you can fire it with findings molded right into it.
as far as soldering silver goes it's not the easiest thing i've ever done. i've already exploded two pieces i made. for the most part i've been told to heat the entire piece up moving the torch in quick circles to evenly heat it up. then concentrate the torch where the solder is to get it to flow.
i'm still in the early learning process, but it's quick to pick up the techniques.
good luck.