nobs@okami:/lib/modules$ aptitude search ~U; aptitude versions ~nlinux-image~i
Package linux-image-2.6-amd64:
i   2.6.32+29                                                                                                             oldstable                                                                                         500

Package linux-image-2.6.32-5-amd64:
i A 2.6.32-48squeeze3                                                                                                     oldstable,oldstable-proposed-updates                                                              500