I've updated my resume every month since I started instructing. It's all about being in the position to jump if the need arises. Was kinda nice to have everything ready to go when I got sick of TSA, and it's made things a little easier with the impending furlough.
The sad part is that the good jobs are the ones that are hard to come by. The entry level crap just lowered their standards rather than trying to do more the entice better candidates.