This is geek heaven. Ifttt allows you send email reminders to yourself, autopost from Google+ to Facebook, alert when it will rain tomorrow, send starred Google reader items to Evernote, backup up Facebook photos to Dropbox, and lots more.
It’s free and users are happily writing all manner of useful tools. You can too. It’s a little confusing at first. Go to channels to add the services you use. Then choose among the selection of options for that service (or make up your own), like notifying you when a new book is added to the Kindle Top 100 free eBooks. Oh wait, someone already wrote that!