Xconomy, the online technology publication, posted an interesting article today regarding Series A funding. I highly recommend you read the entire article and spend some time playing with the online financial calculator the author, Sim Simeonov has created.
Simeonov asks your questions like "What is your Startup Worth" and then walks you through how to get to a true pre-valuation, how to negotiate a better Series A deal, and then shows you how to use the financial calculator to determine the best numbers for you and your team.
He is direct, candid and offers a summary that is simply and succinct. Overall, one of the best articles on funding I have seen in a long time.