I have a cd-rom somewhere that is "Swiss German For Beginners." I actually knew 90% of it at the time, but my wife gave it to me nonetheless. The best part of the program was that there was a man and a woman -- they almost never agreed when it came to pronunciation. I loved it when they actually used different words.

In my opinion you can only learn Swiss German in the locality in which you live. I've come across quite a few immigrants who speak Swiss German perfectly -- so it is possible to do (I've yet to learn a dialect so well). By the way, the first "immigrant" I've ever come across with perfect Swiss German was in St. Gallen -- she was from Slovakia. It is possible, but very, very difficult, which she confirmed.