I've been using Nth Lab's RPN for as long as I've owned a Palm (first on a hand-me-down IIIx and now on an m500). It's shareware, but it's worth it. It's capable and convenient to use. I checked out fancier-looking calculators when I upgraded to the m500, but they didn't seem as usable.
By the way, for simple calculations, I find using a calculator program on a Palm, where you can tap numbers and functions with the stylus, much more convenient than than using a gui calculator on a computer. Of course, using my actual HP48SX is even more convenient, but I don't usually have it around, and none of those replace Mathematica or Octave for complicated calculations.
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I've been using Nth Lab's RPN for as long as I've owned a Palm (first on a hand-me-down IIIx and now on an m500). It's shareware, but it's worth it. It's capable and convenient to use. I checked out fancier-looking calculators when I upgraded to the m500, but they didn't seem as usable.
By the way, for simple calculations, I find using a calculator program on a Palm, where you can tap numbers and functions with the stylus, much more convenient than than using a gui calculator on a computer. Of course, using my actual HP48SX is even more convenient, but I don't usually have it around, and none of those replace Mathematica or Octave for complicated calculations.