Podcasting is really cool (or neaterino) and has a lot of possibilities for all types of libraries, and many of the library blogs have discussed or given examples, especially in reaching a younger audience. I would encourage you to seriously consider its potential and uses. After having listened to a few, a word of advice is in order. (I need this just as much for my own presentations which aren't as yet in podcasting.) Who knows; maybe in a year or so, it will be a topic at an ACL Conference?