The phpesp unofficial package repository has moved to http://www.vanbest.org/debian/dists/unstable/main/binary-all/net/. You can also add the following line to your /etc/apt/sources.list:

deb http://www.vanbest.org/debian/ unstable main non-free contrib

and for package sources:

deb-src http://www.vanbest.org/debian/ unstable main non-free contrib

The GPG key used to sign this archive has key ID 0x63217C63 and fingerprint

DD03 DDF4 8E51 495C 820C  B356 729D 9E95 6321 7C63