I noticed that in debian lenny you need libhal-dev to compile kdeplayground-base and libavformat-dev for k3b from extragear-multimedia from svn. Should that go somewhere else?
how about a 1-step "copy/paste this to install all necessary and optional packages" right at the top
for the last week or so, I haven't been able to build kdelibs on debian/unstable because I had libstrigiqtdbusclient-dev installed, as per this page. Now that I've removed that package, kdelibs builds.