I heard about If This Then That on Tech News Today a couple weeks ago and just started playing around with it today. It's basically a way for you to automate all kinds of tasks based on different web services (mostly social networks) that you use. Some examples:

• Post all new blog posts (RSS entries) to Twitter.
• Add all Last.fm scrobbles in new rows in a Google Drive spreadsheet.
• Save any Youtube videos I mark as "watch later" to Pocket.
• Email me if it's going to rain tomorrow.

I like the idea and hope they can expand it to even more services.