Powerful calculator / scientific calculator type application

[blueandwhiteg3]

I've long used EasyCalc under the Palm OS. I've recently migrated to WM6 and need to locate a similar application. With the larger screen of my PPC 6800 versus the tiny one on my Palm-based Treo, a calculator should be a pleasure to use.

Basically, the premise behind EasyCalc is to replicate much of the functionality of a multi-line scientific calculator. Your calculations are displayed in an editable formula field as you enter information, and it is easy to access recent calculations. The result is simple, powerful and irreplaceable.

You can see what I'm talking about here:
http://easycalc.sourceforge.net/

Any suggestions on something similar for Windows Mobile? I've searched, but everything I am seeing appears to be lacking the editable formula line display. What am I missing?