Let me start out by saying that I virtually *never* recommend any magic products...
That being said, I heartily recommend John Riggs' "The Beautiful Butterfly" (http://www.jonsaintgermain.com/books.htm--although
I'd prefer to keep it to myself).
I purchased it recently on the recommendation of my friend David Alexander and it fulfills my needs 100%.
The Beautiful Butterfly is an Imp Device built into a Mead 3" x 5" spiral pocket notebook. The gimmick is magnetically locking, and virtually invisible. You can hand the notebook to the spectator with confidence that they will not "stumble" onto anything. They write or draw the information, tear the sheet out and hand the book back to you... The impression surface is huge, virtually the same size of the notebook pages and easily cleared (can actually be done in front of the spectator if desired). The actual impression can be picked up through two or three sheets, the peek accomplished easily and openly in a natural action. The one I received has a black cover which is naturally mimicked by the magnetic material when obtaining the peek.
I used it in walk-around last night and found it to be a very effective method of obtaining information... I even had one skeptical spectator examine it closely before returning it to see if any impression was left behind that might be used to discern what they wrote down. The Beautiful Butterfly passed with flying colors.
Handmade and extremely cheap at the price, The Beautiful Butterfly is one of those rare magical accessories that exceeds your expectations...
I also purchased "The Cicada" and "The Grey Mosquito" and have to say that if these are representative of John's other work (and I'm sure they are), he does beautiful work that is meant to be abused by real-world working conditions... Very impressed!
Oh, thanks to David for pointing me this way (and damn him for letting you all know)!
Andrew J. Pinard