Maybe more than you know...
Given that there are two storage vendors sponsoring BSDCan conference this month (http://www.bsdcan.org/2011/), perhaps more than they know. NetApp and Isilon might not be happy about the competition in the enterprise space, especially if someone starts bundling FreeNAS with hardware.
Use of FreeBSD in the embedded storage space has been popular for a while. Supposedly, OnTAP has some FreeBSD code in, because BSD licensed code is viral like the GPL. And the new new GX stuff is supposedly 100% FreeBSD.
And given that OpenSolaris is basically dead, I bet Nexenta is looking into moving to FreeBSD too. If FreeBSD had Containers, it'd be the new Solaris.