Twitter is a microblogging service. With each "entry" being 140 characters or less, the ease which which you can track the tiniest details of your life is amazing. The site has become very popular as a result.
The site is becoming so popular, in fact, that many people are deserting or cutting back on their weblogs to just use the Twitter service for what their weblogging used to fulfill; and with that comes rampant centralization, and with that, greater risk. Back up your tweets!
- Tweetake Using this tool you can back up any public Twitter account. Nice.
- Tweetscan Data downloads your Twitter archive from 12/2007 onward in CSV format (requires Twitter account login/password)
Stable, as far as we can tell. They had some growth issues in their first year but seem healthy now.