Recently I needed to print a poster size image using my home printer. I didn’t feel like slicing up the images into a bunch of tiles and figuring out which goes where. Here are a couple programs that will do this with ease:
Poster Printer by RonyaSoft
http://www.ronyasoft.com/products/proposter/index.html
Easy Poster Printer by GD Soft
http://www.gdsoftware.dk/More.aspx?id=3