Twitter - Broadcast your life.

Well, I hope that title doesn't scare you off. Don't worry, there won't be camera crews following you around. I'm just talking about Twitter, one of the best ways to keep your friends and family updated on what's up.
You can use up to 140 characters to say anything you want, like the address of a website you found, what you're eating for breakfast, or the funny thing your dog is doing. Your friends and family (and anyone else) can join Twitter and follow you, and be updated when you post. Some people are calling it "micro-blogging".
You can post to your Twitter account with a text message from your phone, with your instant messenger or on the Twitter website itself. If you have a blog, you can put your recent updates on it.
It's a really neat service, and I highly recommend it. If you'd like to check out my Twitter profile and maybe even follow me, go to http://twitter.com/SivartM. To get your own Twitter account, go to http://twitter.com.