Bare Escentuals Mineral Foundation is one of the most popular mineral foundations and it comes in the original version which gives your face a slight "sheen" type finish and it comes in a matte version for oilier skintypes or for people who prefer a matte finish. You can find an excellent get-started kit which has all the basic essentials that you need to begin using a mineral makeup at: http://sephora.com/browse/product.jhtml?id=P220533
Smashbox Halo is also an excellent mineral powder foundation. It gives the same "glowing" finish as the BE original formula, but Halo comes in a compact that is a lot less messy to work with than the BE. You can take a look at it at: http://sephora.com/browse/product.jhtml?id=P228100
I hope this helps you.
Bare Minerals is great! Pretty medium coverage, but i dont think mineral lasts all day so you would have to re-apply it throughout. Also you can check out some youtube videos on reviews and mineral application if you need to learn!