My 10 year reunion was last Saturday and I was on the planning committee. We chose to go through a reunion company since it makes things a lot easier. They are able to put money up front, etc. We started with the website
www.classmates.com to get information out to our classmates.
It was a ton of fun but a lot of hard work! Make sure you get a good committee that will follow up on things needed. I suggest for everyone to at least check out reunion companies prior to doing it themselves. The *BIG* plus...they do all the set up and clean up.