Windows 7 demo: Taskbar featuresSociologists say that multitasking has shortened our attention spans and made us more easily distracted than ever. Apparently it's a losing battle. With 4GB or more of memory in the standard Windows PC these days, it's possible to open dozens of windows at once. The challenge for Windows users is how to keep track of all those windows without losing focus. ZDNet's Ed Bott shows you how some new features in Windows 7 can help you multitask more effectively.