Whenever I see how fast Ruby goes I remind myself of all those job offers for AS/400 programmers. I'm glad the Ruby crowd moves ahead so fast. We never get to work on a stale project.
On the other hand, the rate the software gets outdated these days is taxing in a way. It makes me feel happy when I receive a support e-mail for a project that I thought dead for a long time: "Hey, somebody is still using that thing I hacked 8 years ago!"