I'm glad this thread has generated so much interest, and apparently, at least one registration too. Time for me to sign up too....
The brew that caused this whole episode has turned out pretty good... no spoilage or anything. I think the next time I try fruit in the beer I'm going to go with something with a bit more flavour though, like raspberries.
I managed to get the stain off the bathtub also, so all in all no real permanent damage and lots of learned lessons. I was so concerned about the amount of beer I was wasting during racking (because of the extra space taken up by the puree), that I probably filled the carboy a little too high.