Useful approaches for start-ups
Lean start-up Prof. Eisenmann's website has the best set of resourcesSteve Blank's bookEric Ries' bookJudo Strategy Discovery-driven planning
Tools for start-ups
From balsamiq, including twitter updatesFom Prof. Eisenmann's blogCrowd-sourced IDEO list. Also here. Direct link to the google doc is here
Dealing with Investors
Ask the VCNovel start-up financing model from Y-CombinatorGood list of angel investors and accelaratorBarcelona resources for entrepreneursLinks on term sheet, deal terms and legal docs