Business of Software is a great portal for those whose business is development and sale of software. There are great videos, forums, blogs etc. They also hold a annual(I think) conference which has a lot of developers, VC people, marketers and more. The videos of it are really informative and clear.

http://network.businessofsoftware.org/

If you're interested in the making a living from selling software, this is the place to start.
 
 

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