[accountface]

This is an interesting feature that Google doesn't seem to really talk about — it will also list where you took photos, tell you which businesses you've been to, and even go as far to guess your mode of transportation (in the city it'll go as far as guessing bus/train/car/bike with some accuracy).

And there's that typical double-edged sword: there are a lot of situations where I'd find this information really useful... but in order to gain that usefulness Google knows all that information too.