Valencia-Alvarez v. Gonzales, 469 F.3d 1319 (9th Cir. Dec. 6, 2006) (cancellation stop-time rule not impermissibly retroactive as to a noncitizen who was not eligible for cancellation of removal but for conviction of a criminal offense prior to April 1, 1997), distinguishing Sinotes-Cruz v. Gonzales, __ F.3d __ (Nov. 22, 2006) (stop-time rule impermissibly retroactive).
http://caselaw.lp.findlaw.com/data2/circs/9th/0570275p.pdf