There were lots of things I was curious about, like company financial records/statements, some of the legal stuff around employment. The accounting stuff was really useful.

But the real wins were the leadership and management units, to my mind. Learning the "formal" knowledge around this has really helped in subsequent management roles.

The entrepreneurship unit was vaguely hilarious, as I was running a blog for the local startup scene at the same time and neck-deep in Lean Startup, which no-one on the MBA course had heard of. Writing a really tight business plan seemed to be the hardest part of starting a business ;)