Hi Marc-André I've looked a little more at you package of ack-grep. It looks like you're aware of the package currently named ack. Both packages provides /usr/bin/ack which isn't allowed according to Debian Policy chapter 10.1 and having both packages using the same name for source package will break things.
If you want you pacakge uploaded you should fix these problems. Using the same source pacakge names as another package is really a showstopper. I would still be like to sponsor you packages or upload my own packages. //Peter Makholm