Robot News

Robots.net

    /http://robots.net/
        Good source of robot news. Updated a few times a week, typically. Run by members of DPRG

Robot Magazines

Servo
    http://www.servomagazine.com/
        Pretty good monthly, covering most aspects of hobby robotics
Robot
    http://www.botmag.com/
        Good bi-monthly mag
Nuts & Volts
    http://www.nutsvolts.com/
        Monthly general electronic hobbyist mag, has a robotics column. Parent of Servo

Vendors

Sparkfun

    http://www.sparkfun.com/commerce/categories.php
        Lot's of microcontrollers and sensors, among other things
Robot Shop
    http://www.robotshop.us/   
        Lots of robots & components
Trossen
    http://www.trossenrobotics.com/
        Lots of robots & components
MondoTronics/RobotStore
    http://www.robotstore.com/
        Lots of robots & components
Blue Bell Design
    http://www.bluebelldesign.com
        Local consultant firm with robotics product
Lego Mindstorms
    http://mindstorms.lego.com/
        Nice self contained platform, running an ARM processor and an AVR co-processor
MindSensors
    http://www.mindsensors.com/
        Sensor and other accessories for Mindstors, Vex, and other robots
RobotC
    http://www.robotc.net/
        Good C language for Mindstorms & Vex from Carnegie Mellon (not free, but cheap)

Groups

Philly Robotics Meetup
    http://www.meetup.com/Philadelphia-Robotics-Group/
        Us :-)
Delaware Valley Robotics
    http://tech.groups.yahoo.com/group/DelVal_Robotics/
        Local group with yahoo message board
Society Of Robots
    http://www.societyofrobots.com/
        Excellent forum & tutorials. Home of Axon microcontroller
DPRG (Dallas)
    http://www.dprg.org/
        Good tutorials & articles

Competitions