Check out these sites for GIS fellowship, internship, and career opportunities

Some great GIS career tips:

USA:

MyGISJobs 

USA Jobs

The Muse

GIS Jobs Clearinghouse

Geography Jobs

Society of Conservation GIS

Get GIS Jobs

GIS GIG

EarthWorks Jobs

 

International:

Geomatics Canada

GoGeomatics

Canadian GIS & Geomatics