I have the same problem when trying to install with http://ftp.fi.debian.org/debian/dists/testing/main/installer- armel/current/images/kirkwood/netboot/marvell/sheevaplug/uImage and http://ftp.fi.debian.org/debian/dists/testing/main/installer- armel/current/images/kirkwood/netboot/marvell/sheevaplug/uInitrd (the files are dated 28-Nov-2010 04:12)