I signed up to  photojojo time capsule a few months ago and I love it..

Basically they email your past photos from flickr.. At the moment its only flickr accounts that can use it.. You have a choice to to set the time scale from 1 month to 2 years..

It’s brilliant for gardeners  to look back over last years photos and compare. I’ve had a few photo’s from last year emailed to me that I had forgotten  were lurking somewhere on flickr

Here is the link