When I upgraded to Debian 5.0 lately I noticed that there is no Gallery2 package anymore in Lenny. So I asked the Debian maintainer about this.
Here’s what he replied:
Gallery 2 is not available in Lenny due to large amount of differences between the previous version and 2.3-1 from unstable. The release team and I decided not to include Gallery 2 in stable due to this disruptive change late in the release process. The gallery2 package from sid can be installed via pinning.
WTF?! 
WTF?! indeed. I’ve been running Debian and Gallery then Gallery2 for years. I was gobsmacked that there was no Gallery2 in Lenny and so very little news about it. I’m glad I checked the apt-get output before upgrading as I was shocked to see that gallery2 was going to be un-installed. Nice one, not. Pinning to sid is poor IMO, Debian is supposed to be a stable, fire and forget deployment.
Perhaps its time to move to Ubuntu ?
@Peter: In the meantime I upgraded gallery2 to the “testing” (Squeeze) version 2.3-1. The upgrade was painless, and it’s running very smoothly. Let’s hope that this package doesn’t break in the future by some changing dependencies to packages unavailable in “stable”…
I can’t imagine moving to Ubuntu. I fear that I might lose the stability and robustness that Debian is now giving me since almost 10 years(?)… But I might as well just try it out in an OpenVZ virtual machine…