I always keep a current image for Kali (and before that, BackTrack) although I add a few more to my current image repository: up-to-date-patched Windows, UBCD, etc. Of course keeping those Windows images current is a bitch, but saves a ton of hands-on time rescuing machines. Kali could be likened to having a rather large gun in the sock or underwear drawer.
Biting the hand that feeds IT
