Bessemer Venture Partners, which is the oldest VC firm in the US, has picked many winners such as Skype, VeriSign (NASDAQ: VRSN) and LinkedIn. So, what does the firm like right now? Well, one sector is on-demand business applications.

In fact, this week the firm led a $15 million investment in Intacct, which operates a web-based ERP system. In all, the firm has raised $29 million in the past nine months.

"We focus on small and mid size companies," said Marc Linden, Intacct's CFO, in an interview with me. "It's for those businesses that are graduating from Intuit's (NASDAQ: INTU) QuickBooks. And we estimate the market size at $7 billion."

No doubt, there are some tough competitors, such as NetSuite (NYSE: N). But with such a large market size, there should be room for a variety of players.

And what about the slowing economy? According to Linden, there is "no effect yet." Then again, by using an on-demand model, customers may be looking to Intacct to cut costs.

Tom Taulli is the author of various books, including The Complete M&A Handbook (www.mergerbook.com).