The 2012 IT Salary Guide released by business consulting firm Bluewolf shows which IT jobs are hot, and which are not. The annual data is based on salary information collected from thousands of IT staffing placements managed by Bluewolf nationwide. While the report shows the biggest increases in demand for mobile, data, cloud and user-engagement technologists, it also reveals a decline in the number of job candidates with the skill-sets required to meet those needs. "Organizations aren't just competing against each other for qualified tech professionals— they're contending with an ever widening talent gap and the mass exodus of baby boomer retirees," says Bluewolf co-founder and principal Michael Kirven. "This poses a huge challenge for business as they scramble to adopt new flexible technologies that support the Agile Enterprise, but for those with the right skill-sets, this should come as good news." Here are 10 highlights from the report.