The Urban and Regional Information Systems Association (URISA) published a report recently on salaries for GIS practitioners. What they found...
On average, survey respondents earned $60,050 in 2006. Consultants experienced the greatest average increase (from an average of $71,280 in 2003 to a current average annual salary of $96,786). Certified GIS Professionals (GISPs) earn, on average, nearly $9,000 more per year compared to those who are not certified $66,308 vs. $57,669). Most respondents (63.7%) were employed within some level of government and held GIS-related job titles (84.6%), such as GIS Manager, GIS Analyst, GIS Coordinator, etc. On average, respondents have an average of 14 years of professional experience and 10 years of GIS professional experience. The average age of those responding was 39 years. Jobs require them to be at least somewhat proficient with a variety of GIS software. ESRI products were most popular. The leaders included ArcGIS (91.2%), SDE/GeoDatabase (47.9%), ESRI Extensions Network Analyst, 3D Analyst, Spatial Analyst (46.2%), ArcIMS (37.9%), ArcView (34.3%), and ArcPad (26.7%).