no DVDs or classes for this yet, unfortunately. it's one of the trickier topics for sure.

we're working on some new videos and also trying to get a solution put together so that we can teach special topic classes like this via webinar. hopefully we'll have something like that available as an option by '09.

if you're trying to pull off really complex shapes in SKP you'll want to become as familiar as possible with all of the options for the arc tool, follow-me tool, intersect with model command, soften smooth command and the sandbox tools (originally intended for terrain modeling, but quite useful for things like cushions, etc.). 

you might also find the following plugins/rubies to be useful:

soap skin and bubble

tools on surface

sub-divide and smooth

-mike