It was complicated getting this done, but finally backports for 4.1.2 are available at kde4.debian.net. Thanks to the help of Aleix Pol and his Mac Mini, there are available packages for PowerPC now.

As well, I have uploaded a backport of Qt 4.4.3 (*), for AMD64, i386 and PowerPC. If you are using KDE 4.1.x, you definitively want to use this Qt 4 version with a bunch of bugfixes.

A lot of people mailed me in the last week asking about problems with the mirror, this was caused by kde4.debian.net being actually 2 mirrors in round robin and the secondary (and faster) one having some problems syncing.

(*) Yes, I know Qt 4.4.2 and 4.4.3 are equal just with copyright changes, but it was easier backport latest version from unstable, right? :)

I have just finished uploading the Lenny backports for KDE 4.1.1 to http://kde4.debian.net/. I have improved slightly the website and added some information as well.
If you followed the instructions in the website and you are already using the KDE 4.1.0 backports, you only have to update your system and you will get automagically the KDE 4.1.1 packages.

Enjoy!

Now Lenny has been frozen for some time and the necessary packages have migrated to Lenny (that remember is still testing); I have finally made the backports of KDE 4.1.0. You can find the repository and the instructions at:

http://kde4.debian.net/

And remember, KDE 4.1 is pretty good but it still has some issues that are little to little being fixed. Do no expect something so rock solid as KDE 3.5.x yet :)