According to Fanhouse, playmaking tight end Alge Crumpler is now available. Crumpler, who hasn't really played with good passing quarterbacks, still managed to average 13.3 yards per reception in Atlanta. That's a tight end that can get downfield and make plays. If you want a comparison, the best TE of this era, Tony Gonzalez, has a career average of 12.1 yards per catch and has never had a single season matching Crumpler's career average. Considering Crumpler is 30 and had his best years from '04-'06, I think he's got game left. And I would love for the Vikings to sign him. They definitely need a pass catcher with Crumpler's abilities.
The Fanhouse post also notes Byron Leftwich is available. Though I don't think his style fits the Vikings' current offense, they are in desperate need of (at the very least) a backup for Tarvaris Jackson. Leftwich's presence among available QBs at least deepens the available pool--giving the Vikes a slightly better chance to pursue a different QB they might want.