From Jayski.com:

Kluever to be released from Roush Racing? DENIED RacingOne is hearing Todd Kluever could be released from Roush Racing due in part to both his lackluster performance in the Busch Series [#06 Ford] this season and the proposed cap for NEXTEL Cup teams, which would force Jack Roush to eliminate one of his cars. Kluever had been named to take over the #6 NEXTEL Cup ride [AAA Ford] from the retiring Mark Martin next year, but if Roush is forced to eliminate one of his teams to fit under the cap of four, that team may be the one to go. The AAA sponsorship could then be shifted to Greg Biffle's #16, which will reportedly lose the National Guard sponsorship after this season. Kluever, who is scheduled to make his Cup Series debut [in the #06 3M Ford] at Chicagoland, has only one top-10 finish in the Busch Series this season. He also sits 23rd in the points.(RacingOne), hard to imagine Roush just letting the #6 number go bye-bye.
UPDATE: been told by Roush Racing representatives that there is no truth to the rumor regarding Todd Kluever being released from Roush Racing. There has been no change in plans regarding his future at Roush and that Kluever will still be in the #6 AAA Ford in 2007.(5-16-2006)