There is an online marketplace targeted at small and medium businesses that enables these companies to auction their account receivables. The entity that operates this exchange is The Receivables Exchange or TRE. You can view them at www.receivablesexchange.com. TRE was the 2010 Innovation Award winner in the e-commerce category.
Check out this online marketplace. It still serves smaller companies and may be just what you need to free up your business cash flow.