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As a visual person, I always rely on drawing diagrams when ever I try to learn something. Mind Maps (back then I didn’t know this term ) were very helpful during my undergrads and I used them a lot for tutoring as well.  Few months back I found XMind, a wonderful tool for mind mapping. The free version is more than enough for studies with plenty of features. However there was a one limitation with the free version. It does not allow to save the mind maps in PDF format. This feature is only available in XMinde Pro version.

Fortunately I found PDFCreator, yet another free and open source tool. Once installed it acts as a pseudo printer. You can set it as your default printer and when ever you send anything to print, it will generate a nice PDF file for you. 

With this approach I managed to get the maximum usage from my favourite mind mapping tool.