I had the same issue after upgrading libc6 to libc6_2.7-18lenny4_armel.deb. I fixed the issue by downloading libc6_2.5.1-1eglibc25+0m5_armel.deb from the Maemo repository. Try this in terminal

sudo gainroot
wget http://repository.maemo.org/pool/mae...0+0m5_i386.deb
dpkg -i libc6_2.5.1-1eglibc20+0m5_i386.deb

you will get a warning that the package is downgrading. I didnt even need to reboot - it instantly fixed the problem!!!