So I place a stick of dynamite on top of an otherwise unbreakable device, then move to the square under the device, thinking the dynamite would just create a small circular explosion and break whatever is next to it. But no, it pierces through in a cross shape as if I'm playing Bomberman, and I'm immediately killed.
KaasChuig - You can sell items. Right-click on an item in your inventory and a box will appear that lets you sell things. It looks like you get half of the cost back, rounded down. So if you're planning on playing beyond the next update, you might want to hold onto your crafting materials in case you need them to make any new equipment that's available. (If you sell a thing and buy it again later, you'll just end up wasting souls - certainly an insignificant number if you're only selling dust, but still.)