Local Running Clubs:
New Balance Delaware and their Racing Team Page
Pike Creek Valley Running Club
Races and Routes:
My Maps (gmaps I created for runs mostly around UD, Creek Road, Newark)
Google Pedometer (great tool to create your own runs)
Races2Run (start here for local DE races)
Seashore Striders (Rehobeth area runs and races)
Competitor (national races)
Rock n' Roll (the 13.1 and 26.2 series)