If you are relatively new to chip collecting here is a link that contains some valuable information about slabing. It was put together by some of the most respected people in our hobby. It should answer most of the questions that you have.

http://slabfree.marlowcasinochips.com/whybeslabfree.htm

On a personal note, I would like to once again thank everyone involved with the slabfree movement, and David for keeping the site alive.