I also wanted to comment on why fitting in +20 spot and search item is important, since a number of people have asked, some have said it is stupid, etc,etc. (LOL)
I have been using the drow racial enhancement nothing is hidden. It automatically makes a search check without searching! I love this enough to keep it. At first I though OK, I will try it and then just go back to the usual methods. Not having to search is such a time saver and has a very high convenience factor! I am only able to fit it in at tier II which comes with a -8 search penalty, so maxing both spot and search when using this enhancement is very important. It only requires 4 additional points in the racial tree to get tier 2 or 6 to get tier 3 (for only a -4 penalty). If I could, I would go to tier 3, but that would require sacrifices elsewhere I am not willing to make.
You can literally zerg and still get the traps, even on EE! Important for me for 2 reasons, XP bonus and not falling behind the zerg group when getting traps.
Also the comments all the dumazz barbs make as they blunder into the traps as they are being auto revealed is priceless.