Rasterbator is probably the most useful little freeware app I’ve come across lately. You can create rasterized versions of any image that can be printed, and then assembled into huge posters. See what people are doing
Constantinos is employed as a Creative Director for Tribal DDB Athens. In his ever dwindling spare time he works on the development of UX Magazine and Joblet. You can find out more about him here of follow him on twitter.