Silly me, it seems I've volunteered for KCalc duties. There are a tiny handful of apps that need some loving or they will be dropped from the KDE 4 release. KCalc was one of them. Since this is an app I use frequently I stepped forward. I hope there won't be a trigonometry quiz on this!
The first major problem I see is the interface. I am currently converting this to Designer UI format. The other major problem is the use of GMP. It's license was recently changed to LGPL3, which some people say is incompatible with KCalc's GPL2+.