Calculator frenzy!
I mentioned before that I have a Ti89 at work and this was recently spotted by an HP-phile colleague. To show off to me I now have their HP 50g on extended loan and I have to say that I am quite jealous. I love that Forth-like goodness of the RPL option and some of the more weird (but useful) functions. I miss the spreadsheet-like Table Editor of the Ti89, but I should be able to mimic that with vector manipulations on the HP - and there are also some third party apps for the HP. I'll play with it some more. I'm hoping that someone else has an NSpire CAS for further comparisons, but I hear that one is a bit of a disappointment.