There use to be discussion of a pretty full-featured calculator but for the life of me I cannot remember its name. I think it had advertising - they also made a flash-card type app, I believe. You might search the crackberry shop or app world. I'm sure that has to be a hex-decimal calc available. Hmmm, wonder if doc-to-go excel's got something in it????
Found one but it is quite confusing to use as I think it was not intended for a full qwerty keypad altho it even mentions touchscreens. It is a jad or cod file and written for java phones and not specifically for BB. I think I have it figured out but .... well interesting....