Over the past few years, I have used several online services. I use flickr and Picasa to store photos. I also use Twitter and TripIt. With all of these sites, it is hard to get a consolidated view of these disparate sets of data.
Memolane is an interesting site that lets you view your online "lifestream" chronologically, in a single unified view. I like that you can go back in time and see what you were doing on certain dates.
It looks like Memolane is having a problem importing my Twitter feed, but once that problem is fixed, I could see using this as a visualization tool.