As we approach the official kick-off to summer getaways with Memorial Day weekend, a recent study from CareerBuilder shows financial constraints and demanding work schedules have some workers foregoing vacation plans this year. Twenty-four percent of full-time workers reported they can't afford to take a vacation in 2011, up from 21 percent last year. Another 12 percent reported they can afford a vacation, but don't have plans to take one this year. More than 5,600 workers participated in the nationwide study, which was conducted from February 21 to March 10, 2011.