I just signed up to Hitchlog, a cool new service which allows you to record all of your hitchhiking trips and then gives you stats based on your aggregated trips.
I diligently went through today and added all my trips from my Europe trip in 2010. You can see them all here in my profile.
I was pretty foggy on number of rides and times but I was able to figure out dates pretty well by looking back through my facebook updates (thank you timeline). It was nice to relive all the trips in my head as I tried to recall each ride and looking through my activities on facebook while I was living those experiences.