Bank of America is still dealing with its legacy mortgage issues which have been a regular source of concern for the company over the last 3 years.

FORBES: Taking Stock of Bank of America's Mortgage Business

Like UPS, these companies have the trucks (their product lines) and the drivers (their sales force) and what they need now is a regular source of new packages (products) to deliver to customers.

FORBES: Software PACMAN

At the same time these sites are a source of casual work or even a regular pipeline for people who can build business from prices where margin is always at risk.

FORBES: Where Is The Digital Workforce Growing Fastest?

The studios have discovered that great books can also be a source for great screenplays, churning out a regular diet of adaptations of 19th-century fiction.

ECONOMIST: Life in Los Angeles

Its housing guide is a good source of advertising revenue since housing management companies generally have regular cash flow.

FORBES: Wharton Start-Up, Chattersource, Helps Students Find Housing, Haircuts