Well, Debuian testing can be considered beta, too. I spent the last 2 days now with getting the system running again, after I ran fsck on my ext3 fs, which moved ~300 blocks to lost and found. When booting, it told me the disk is readonly. With init=/bin/bash, mount told me rw, but running any command gave me again readonly. With KNOPPIX, some dpkg and awk magic, I just have to recreate the symlinks for lilo, install the kernel-packages and the nvidia module. I don't know what exactly happened, but I want to warn anyone, that a disk that runs flawlessly for 1,5 years now, should be fsck'ed just for fun.