in reply to poll ideas quest 2012

Every year it seems there's a new paradigm/tool/technology for software engineers to become familiar with. The reasons range from "because everyone else is doing it" to "wow that's a great idea". Various examples, in no way intended to condone or detract from anyone or anything, might be: Moose, Catalyst, PSGI, KiokuDB, MongoDB, mootools, dojo, JQuery, Node.js, etc. What is your best practice when you see a new technology mentioned somewhere?