9,999,999 Gold
When you find the location of the lost hoard of the obelisks, the treasure includes 250,000 gold. Open and close the location or chest it's at before leaving the location and the gold will increase by 250,000 gold pieces every time. Repeat until you have 9,999,999 gold pieces.
NOTE: This trick relies on a bug in version 1.0. It will not work in version 1.1 or later.
Get Weapons, Items, etc.
Some powerful enemies drop high-level items more frequently than others. In particular, Power Liches, Dragons and Veterans will drop an item 30% of the time. Save your game before checking a body and restore if a valuable item doesn't come up on the search.
Tons of Experience
Go to the town of Kriegspire after doing the 9,999,999 gold trick. There is a well in town that takes 5,000 gold but gives 5,000 experience. Use that well over and over again until for each of your characters.
Use the "Shrine of the Gods" more tham once
Go to the Shine of the Gods when two or three people in your group are dead. One of the living must have a healing spell. Go to turn-based mode near the shrine and heal one of the dead characters and when the monsters turn click on the shrine and you get +20 to all your stats.
9,999,999 Gold...