Cool private companies: 3 software firms making a splash (and cash)

As a software securities analyst, Richard Davis spends 200 days a year on the road visiting software companies. He goes to public companies such as Oracle and Salesforce.com, but he also visits up-and-coming software companies he thinks will go public in the near future. In his new column, Davis is going to talk about some candidates he thinks may be ripe for the IPO class of 2012 or 2013.