From Jayski.com:

UPDATE: #99-Dale Jarrett, the 1999 NASCAR Cup champion, is expected to help head up the company's [Toyota] 2007 entry into the series, agreeing to join Michael Waltrip Racing next season. Several sources have confirmed that Jarrett, 49, informed Robert Yates Racing officials of his decision April 26. UPS, the primary sponsor of the No. 88 Ford, is also in the final year of its contract with the team. And sources have indicated that the overnight delivery service provider would like to remain with RYR, provided the team can sign a competitive driver rather than someone just embarking on a Cup career. If the latter is the case, it's likely that UPS will make the move with Jarrett to Waltrip's organization. RYR typically attempts to sign sponsors for the length of its drivers' contracts. Because of that, those sponsors have some leverage in driver selection. Possible driver candidates that have been mentioned in the Toyota mix have included Richard Childress Racing's Kevin Harvick and owner/driver Robby Gordon. However, car owner Richard Childress said April 29 that he is close to signing Harvick to an extension. Gordon, who has fielded his own team since 2005, has an existing relationship with Red Bull through his off-road racing efforts.(in part from SceneDaily.com)(5-3-2006)