Supermark and Paul might be talking about different sorts of sensations.
During meditation, there are those kinds of sensations which had been there all along, and which you start noticing only because you're now keeping still.
But meditation can also give rise to a variety of other sensations, which depending on which philosophy you're inclined to, are explained in different ways.
Eg chakras opening up; kundalini moving; or you becoming aware of your energetic body. I also think that the exact kind of sensations experienced vary from person to person.
It's my arms and hands that tingle - it feels like "energy". My legs have had small, sudden sensations of little muscles unknotting or loosening. I get the feeling of pressure in the middle of my forehead, and occasionally the sensation of a movement in my chest which I can only describe as "opening up and going round and round". But as I said, I think it varies a lot from person to person.
Just yesterday I was feeling a little angry with a faceless somebody on the Internet (yah, I know, very stupid - and normally I hardly ever get angry with anything). Anyway I decided to do a little meditating to calm myself down, and to my surprise, for the first time, I felt the tingling in my face, quite sharp and intense.
I wasn't very sure what to do with it, I sensed this might not be good; I just decided to stop meditating.