Volunteering in Israel

A few months ago I was asked whether I would be willing to volunteer giving free Math lessons to school students. I accepted willingly and am enjoying it a lot. Since then, my wife has started volunteering giving English lessons as well.
I believe it is important both for society and for the person himself to do some kind of volunteering job once in a while.
In that spirit, if you live in Israel and are looking for a place where your skills might be needed, I suggest you check out this volunteering search engine.