Birding
All about - Birding.com
Database - BirdLife

Coin Collecting
Info numismatics

Collecting
coin collecting, Numismatics
Stamps online - virtual stamp club

Hobbies
Dog shows - info dog
find a forum - EZBoards
Robotics news/resource - robotics online
Robotics resource/research - cmu
Robotics student competition - usfirst

Knitting
resource/guide - about.com
Knitting Community - Knitsmith

Sewing
resource/guide

Stamp Collecting
On line - virtual stamp club