Is Twitter down?
No sooner had I tweeted on Twitter that I was "officially" boycotting Twitter for a week (in terms of no new tweets), when I tried to go to Twitter.com to see if I could figure out what was broken and I was suddenly unable to go to the main web site. Just like that. I am able to get to the Twitter blog, but not to the main web site.
Oops... I just checked and the main Twitter.com web site is once more accessible. Still, there seemed to be some sort of outage there for a spell.