I was searching for scientific calculator and came across this one:
gCalc!

I haven't seen this posted here, so I thought I would! To download it, just go to downloads at the top, and choose gCalc (or their other apps if you so desire) and download the OTA or .zip file. I just did it (I have OS 4.5 on my 8310) and it works like a charm! I absolutely LOVE IT!!!

Thanks, I will add that to the FAQ list of third party applications!

wow those guys make some SWEET software. surprisingly free too..

Yes, they do. I'm using got-2 (task management s.w). They have suite called gWhiz which includes 4 diff softwares. They are ad based, you will see a small banner when you exit the app.

free internet?

What?