If you want the ability to print web part pages it looks like there could be quite a few ways of doing this http://www.imakenews.com/mernstmann/e_article000435389.cfm
or
This is the whole bang shoot feature and all http://www.sharepoint-tips.com/2007/01/how-to-add-print-list-option-to-list.html
If you must part with cash there is this http://www.sharepointprinting.com/
