[talideon]

Which ports system? I can't say anything about OpenBSD ports, but aside from some stuff that gets very little love from people, most of the FreeBSD ports tree is kept bang up to date, and binary packages appear shortly thereafter. pkgsrc, OTOH, is only released quarterly, though if you want, you can sync with their CVS repo, though, y'know, CVS.

The BSDs aren't distros, though some do have what might be called distros, such as PC BSD, pfSense, &c. being distros of FreeBSD, EdgeBSD being a distro of NetBSD.

The ports system is a rolling release system for non-base software though, though the base OS isn't. The closest BSD to come to having a rolling release schedule for the base OS is OpenBSD, with its six-month release cycle. The thing is that the BSDs can't have a rolling release schedule as is found in some Linux distros because the base OS is managed separately from the ports/packages: the core OS components aren't packaged, so there's no sense in which they can 'roll'.

Personally, I'd never use an OS with a rolling release cycle on a server. Too much can go wrong.