Version:           3.5 (using KDE 3.5.0 Level "a" , SUSE 10.0 UNSUPPORTED)
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.13-15.ck6.SUPER.1-default

One can assign dates and tasks to multiple categories, but the calendar entry is colored with only one of them. It would be better to see every color, maybe by using a streaky or checkered background or by using colored button-like icons. BTW, maybe it would be a nice feature if one could choose a category's identity from a set of tiny icons, which are e.g. to display on the edge of every dates border with identical backgrounds for every date/task. I believe this might look a bit more respectable than it looks at the moment.