[Thanks to everyone who sent this in]
Update: Here's a statement we got from Sprint:
"We did have some disruption to Sprint SMS traffic earlier tonight, but it wasn't a complete disruption -- we lost partial capacity for about an hour. Engineers immediately began rerouting traffic and after about an hour things went back to normal.
There is no significant voice disruption anywhere in the US except for a small part of our Sprint network in the Washington, DC area. That has since been resolved and had no relation to the SMS disruption."