Duplicate Items
Open you inventory left click the item you want to duplicate. Drag it outside of the inventory screen and (Make sure there is an X on the item) While still holding the left mouse button press Cntrl + L (Quick load) while the game is quick loading and the load bar starts to fill let go of the mouse button when the game loads your original item will be in your inventory and the duplicate will be on the ground where you put it. Quick save before you try this and when it is successful quick save again before you try to duplicate another item or they will be lost.

If you have 20 super potions it will duplicate 20 super potions giving you 40 total it works with everything as far as I can tell even money. I noticed with weapons though that when the one your are using receives damage the duplicate does too. I found this on accident and it took me awhile to realize what I did and a little while longer to figure it all out.

Control Bosses:
Two of the most powerful skills are Resurrect and Aura of Command. With these two skills, you can have some of the best creatures fight for you. Kill a Boss-like creature, then resurrect him. Next, cast Aura Of Command on him. He will join your team and protect you. Try this on the dead Dragonrider south of Aleroth and the Protector of the Cyclops Eye (he conjures conjurers). Anything that leaves a carcass can aid your fight.

Keep Slasher Glitch
In a quest you get from an Orc in the Aleroth catacombs you are asked to retrieve an axe called Slasher. You will find slasher deeper in the catacombs.

When you find it, instead of going to the Orc with it, put it in a chest/barrel back in Aleroth. Then go to the Orc and say that you have found Slasher. You will give it to him even though you don't have it in your inventory. He will kill an Orc to test it and go back to the Orc camp. Now you can go back to your chest/barrel and get the axe. Then you will have the Axe and completed the quest. If you want you can sell it, or keep it untill you are strong enough to use it.