If you're looking for an iPhone app, I use a tool called Momento to do this. It's nicely designed, is fairly functional, and works well so far. The only major d

If you're looking for an iPhone app, I use a tool called Momento to do this. It's nicely designed, is fairly functional, and works well so far. The only major downside is its inability to sync with external services like Dropbox to back up your data (you can do that manually through iTunes, but it's a pain).