If you resurrect a group of opponents (or one strong one) then run or teleport away, they will turn hostile and you can return to kill them again (for more experience and/or loot). This can get boring fast, though, unless you just resurrect and leave them for the next time you happen by (say with groups of lizard men in the Dark Forest, who have a small chance of dropping gold charms). I played with this a bit in Iona's dungeon, with a guardian by the teleporter pad (that always dropped something half decent when killed), but not nearly enough to account for an extra 13 stacks of 50k gold and 18 silver charms. Mostly I just used this to make sure I went up a level before getting a level bonus (wishing well or imp world jug), to maximize the experience points received.
You can buy ale from Rimmer for something like 10 gold and sell it for 50, though buying it is rather slow since it needs to be done through conversation options. A long time ago someone made an unreasonable sounding claim about how fast gold could be gotten this way, so I used a macro program to test it out. I don't recall how much I made, but it couldn't have been more than 20k at the most (I had the macro loop until my character got close to his weight capacity, which took about 10 or 15 minutes). I should have reloaded after this, but didn't realize until playing for another while that this experiment resulted in the conversation log loading a little slower.
There is only one Beetle statuette in the game (the description says bee, but it turns you into a beetle).
You can get it by killing the talking tree in the Dark Forest, which can only be done using Buad's tea, from the cellar of the alchemist in Verdistis. Standing moderately near the talking tree, you can drag and drop an open barrel of tea onto the tree to kill it. Click on an open barrel to close it if you wish to put it on the ground or otherwise move it around, or it will break and possibly damage your character.
I sorted everything into multiple chests (see
here). There is an exploit you can use to carry excess weight, which can be used to just load up on chests of stuff before heading to the wastelands, etc. There is a potential problem with this, though, so you need to save first to be able to easily recover if there is an issue.
weight bug and disappearing chests (broken links are fixed in a reply, and the screenshot links re-fixed in another)