I have had kde 3.2 crash only once and I'm pretty sure that even that was operator-induced (in the sense that I was playing with kdevelop and ran some really ugly code
).
In general, programs seem to crash less than before and, when they do, do so gracefully; I have lost no significant amounts of data.
Kde 3.2 is wonderful. My work forces me to use various versions of, shall we say, a competing brand, all of which have caused me many more headaches than Linux+KDE. In addition, real problems with kde tend to get fixed more quickly.
In concrete terms I have had konqueror crash twice since I started using KDE 3.2 two weeks ago but, on the other hand, I bet that after 6 months of use (and patches) the number will not have grown significantly.