Since the advent of the PDA–and to a lesser degree, cell phones and laptops–workers have been decrying the end of vacation as they know it. Technology has given employers the ability to reach workers at all times in all places–making it impossible for employees to maintain boundaries between times off and being on-the-clock. The villains in these equations were a combination of pushy bosses, workers with poor time-management skills and wireless connectivity.

However, reports and studies increasingly suggest that many workers simply can’t disconnect. One in four workers said they plan to stay connected with work while they’re on vacation this summer, a percentage that has nearly doubled in the last two years, according to a survey released by CareerBuilder.com May 20.