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US Small Business Administration- detailed guide to obtaining financing for small business owners.  topics include: basic financing topics, SBA Loan Programs, financing eligibility, surety bonds, equity capital, special purpose loans, microlending.

And for those of us in the UK...

The British Venture Capital Association
Information about the Small Firms Loan Guarantee Scheme
Some information from the BBC about funding
A bit on overdrafts (a good idea?!) and venture capital (for those trying to raise serious amounts of cash!)

Having said all that, the single best thing I did was get some one-to-one advice from my bank, my accountant and my friends.

Good luck!