cats wrote: Jon Kabat-Zinn and Ian Gawler's guided meditations don't have a religious core. I'm sure there are many more, but these two first popped into my mind.
Zinn is your man. He has been bringing meditation to the masses in a format that is not only not religious, it's not pseudo-scientific, as some others are. He doesn't try to explain anything; he just tells you what works and how to do and imagine it.
I used these for over a year now. If you have pain they're excellent, but you can substitute buzzing, numbness or any other sensation http://www.amazon.com/Mindfulness-Medit ... 100&sr=8-1
These are amazing. The only caveat is that even as an American, his New York accent took time to get used to.
Here he is on Wikipedia: http://en.wikipedia.org/wiki/Jon_Kabat-Zinn
Good Luck, you're on to the right stuff.