Paul Graham's "How to Raise Money"
Startup Codex

Definitely one of the best posts on fundraising.

Paul Graham brings indispensable keys to understanding the stakes of a fundraising operation, the reasoning of investors, the relationships to be established with them throughout the process and its impact on the life of the founders.

A necessary reading for any founder who has not yet gone through this process, and certainly very useful for all the others.

Don't raise money unless you want it and it wants you.