The Valley's venture capitalists fall into and out of love with enterprise software. Today, with Facebook and other social networks the talk of the town, it's hard for the makers of boring IT products to get attention. But not, it seems, money. Splunk, in a lightning-fast fundraising effort, has pulled in $25 million in a third round of financing, bringing the company's valuation up to $120 million. Splunk's software analyzes server logs, and in a nod to the collaborative aspects of Web 2.0, lets sysadmins share and discuss the results to figure out if odd patterns are signs of system failures or security breaches. Think of it as a Google for hardcore nerds, but one they're actually willing to pay for. And that, in turn, made Ignition Venture Partners, a Seattle-area venture-capital firm, willing to pay for a stake in the San Francisco company. In every investment, there are winners and losers, though.