Hey I'm new here and thought i would contribute with a little spreadsheet that helps me make some of my gold.
The spreadsheet calculates profit from,
Propecting
Jewelcrafting
Disenchanting

Works well if you have any of the above professions, preferably both.

Remenber is is all about theoretical so do not count on it to be exact.

Link is: excells.net/2010/12/27/cataclysm-prospecting-and-jc-disenchant-spreadsheet/

More spreadsheets and gold guides to come in future!
Happy Cataclysm!
Excells!

UPDATED 2/3/11
Same download link, much better calculations!
Have Fun!