Their first client is OpenNMS, an open source enterprise grade network management platform. They're seeking help regarding violations of the GPL.
If you're not familiar with the second name partner on the door, Daniel Ravicher (above) is legal director of the SFLC and previously worked at Skadden, Arps, Slate, Meagher & Flom LLP, where I've heard they pay their lawyers well.
Ravicher is also a a registered patent attorney and litigator who also founded the Public Patent Foundation.
Seriously, this move not only illustrates something positive for the law firm but for open source generally.
Seeing open source advocacy performed by lawyers who also work the proprietary side of the street always struck me as passing strange. But not merely as strange as lawyers working for businesses free.
Hopefully this is the start of a trend.