These resources made the blog rounds a while back, but I just now got the chance to really look into it.
Startup School has a bunch of great presentations on starting a business in both pdf and audio formats. There is everything from general advice through finance advice.
The related website, Startup Wiki is just what it sounds like. A wiki outlining a nice set of business startup resources.
This is the Startup Wiki for discussing and collaborating on all aspects of startups.