My wife is taking Caltrain this morning, and the trains are backed up. She called me to ask me to find out what's going on. Of course there's nothing on their web site (caltrain.org) and there's no way to talk to a human being... but then I remembered Michael Arrington and the chicken, and checked out TweetScan. Sure enough, http://tweetscan.com/index.php?s=caltrain&u= confirms an accident at Menlo Park and suggests that northbound might restart soon. Which isn't a lot but is a lot more than we're getting from the 'official' sources. @floatingatoll notes: Wishing they used Twitter so I could receive updates.
NB: One annoying thing with TweetScan is that all times appear to be in Eastern US time zone. Come on guys, invest in a calendar library.