Useful services

MAPfrappe - visually shows the difference between the longitude and latitude of 2 points on Google Maps. I never knew that my city is on the same horizontal line with Moscow and Vancouver is so much more to the south.

rss2lj - translates any RSS to LiveJournal (from a standalone blog, for example) as long as the latter is still alive.

One click backup for Google services

Bookmarks, Calendar, Reader:
https://www.google.com/bookmarks/bookmarks.html
https://www.google.com/calendar/exporticalzip
https://www.google.com/reader/subscriptions/export?hl=en
Blogger, Docs and Contacts only work through many clicks...