Professional:
Boxes and Arrows
"... a peer-written journal dedicated to discussing, improving and promoting the work of this community..."

Elegant Hack: Gleanings
Christina Wodtke's weblog about all things IA and lots of other stuff too

American Society for Information Science and Technology
Lots of IAs subscribe to the ASIST IA list

AIFIA | Asilomar Institute for Information Architecture
A non-profit volunteer organization dedicated to advancing and promoting information architecture

NYC Usability Professionals Association
Really good speakers and events

A List Apart
Must read if you're into web design and production

Personal:
Tinkoff.com
Because Adam is my friend

hank99
Jody is an amazing information architect

OddTodd
Pee in your pants funny

Marianne Petit
Great artist, and also my thesis advisor

Oddcast Dress 'M Up Dubya
This speaks for itself