Operating Cash Flow Ratio
A measure of how well current liabilities are covered by the cash flow generated from a company's operations.
Formula: 
Investopedia Commentary
The operating cash flow ratio can gauge a company's liquidity in the short term. Using cash flow as opposed to income is sometimes a better indication of liquidity simply because, as we know, cash is how bills are normally paid off.
Related Links
Operating Cash Flow: Better Than Net Income?
The Essentials Of Cash Flow
Advanced Financial Statement Analysis
See also: Cash Flow, Current Liabilities, Income, Liquidity, Operating Cash Flow