First of all, thank you all for replying!

Bizshop - No, I know where the default calculator is, but my problem is that I really like the method of entry in EasyCalc -- almost exactly like galculator's 'paper' mode.

The only one problem I have with galculator that I've installed on my n800 is the fact that not all of the buttons are visible (some get cut off) and the popup keyboard gets in my way all the time.

The other thing that I'm not sure if galculator does or not is graphing.
I'll check out the link that slip sent me, that MathJinni program and let you all know how it works out.

Thank you all very much for your speedy replies!