On my system, the 8 largest packages are:

213409160 openoffice.org-core
64091981 glibc-common
55539464 kdebase
51267142 kdepim
46532500 libstdc++-devel
46209085 kdelibs
43073422 qt-devel
42256845 wine

qt-devel pulls in more than a whole Win32 environment!

Looking at where that all comes from, it's mostly from documentation:
[david@desktop ~]$ du -hsc /usr/share/doc/qt-devel-3.3.5/*
12M     /usr/share/doc/qt-devel-3.3.5/examples
33M     /usr/share/doc/qt-devel-3.3.5/html
1.1M    /usr/share/doc/qt-devel-3.3.5/tutorial
46M     total

Most people only want qt-devel in order to compile Qt + KDE applications. The 
documentation is just a wasted download for us. (The qt-devel RPM is 15Mb - it 
takes several minutes even on broadband - I have 512kbps).

An extra qt-devel-apidocs sub-package ought to be created with this stuff, as 
it was for kdelibs-devel.

Thank you for your consideration!