YouthMin.org has a great post about youth ministry blogs. Specifically, Ben Read tells us what his favourite blogs are and why he reads them. There are some familiar names on that list, plus a few which are probably new to us.
Youth Ministry blogging is one area (of many!) where the evangelical world is still light years ahead of our efforts on this side of the Tiber. They have some great sites offering some great resources and insights. They also produce a plethora of great youth ministry books - like the Mark Oestreicher book I'm currently reading, for instance.
Having said that though, we do have some good youth ministry sites in the Catholic world, like these ones for instance.
If you can think of any more stick 'em in the combox below...