Hi maxwellhouse1 - With Windows 7 you get access to a lot of cool features that you cannot access with XP. Also, many companies have stopped creating new software for XP as the Operating System is over 10 years old. I'd say it's worth upgrading simply to stay current.
With that said, I also agree with anonymous1. If you're running XP on an older machine, it may be worth it to purchase a new computer with Windows 7 pre-installed. That's only a decision you can make