http://www.doylespokerroom.com/poker...ker_online.cfm

I'll post this for a couple of reasons:

1) Steve Zolotow's comments on the linked-to page are apt here, on the value in learning variants.

2) Free Super System II (yay, free book!). The Hold'em sections in SSII are meh, but there's some good information in the other sections, where literature is not quite as plentiful. Of particular relevance to this thread, Todd Brunson wrote a section on Stud/8.