Every campaign gets an Adventure Log, a blog for your adventures!
The Adventure Log will allow you to chronologically order the happenings of your campaign. It serves as the record of what has passed. After each gaming session, come to the Adventure Log and write up what happened. In time, it will grow into a great story!
Best of all, each Adventure Log post is also a wiki page! You can link back and forth with your wiki, characters, and so forth as you wish.