When I come across a new kanji in a paper or book, I have a really hard time finding it in a dictionary. The fastest way (at work) is to open a drawing program, copy it the best I can, then send the picture to a Japanese-speaking friend. But sometimes he's busy or on vacation.
It'd be great if there was an online tool that took the place of my friend. I'd copy the kanji into a box with my mouse and the tool would try to tell me which it is.