Here is a list of job links and an employment search engine for the USA.

Careerjet

WorkInTexas.com site. 
https://wit.twc.state.tx.us/WORKINTEXAS/wtx?pageid=APP_HOME

Texas Commission on Environmental Quality
http://www.tceq.state.tx.us/admin/employ/index.html

Texas Parks and Wildlife
http://www.tpwd.state.tx.us/business/jobs/

Lower Colorado River Authority (LCRA)
http://www.lcra.org/about/employment/index.html

The City of Austin
http://www.ci.austin.tx.us/hr/default.htm

The City of San Antonio
http://www.sanantonio.gov/hr/?res=1280&ver=true

The City of Houston
http://www.houstontx.gov/jobs/index.html

The City of Dallas
http://www.dallascityhall.com/

GIS JOBS.COM
http://www.gisjobs.com
http://careers.esri.com/