I think Rob's Micropreneur Academy is totally worth it - Rob is creating an MBA-like program for microISVs. The content is first rate (ahem, I wrote the blogging and Twitter modules), the forums are robust and he's got a 1/2 price sale on today (Nov. 17, 2009).
("But Bob, isn't your startup http://startuptodo.com a competitor to Micropreneur Academy? Shouldn't you be telling people it's terrible, horrible, don't spend your money there and he hurts kittens?" [a Business of Software Conference inside joke.])
First off, if you're not prepared to spend a few dollars at both our services, you should reconsider doing a startup. Second, Rob focuses on the context you need to build your microISV. I focus on saving you big globs of time while building it. Answers.OnStartups.com can help you with very specific questions. You should be spending time, attention and money at all three.
Bottom line, the Micropreneur Academy is definitely worth joining... and while you have your credit card out, come check out StartupToDo.com.