I was e-mailing a vendor contact as part of a document review process and received this "out of office" message. I think it's perfect. I've cleaned it up a bit below but I think this is a sign of things to come - don't push away, simply redirect:
I'm at the <insert name of event or business trip> between <dates> and will have delayed access to e-mail. If you have an extremely urgent issue, then call me directly at <cell phone info>.
If you want to keep track of me, then follow me via Twitter at http://twitter.com/<name> or via FriendFeed at http://friendfeed.com/<name>.
Out-of-office replaced by shared situational awareness.