I've got mine stored in albums separated by states first, then alphabetically by casino in each state. The only groups I have are the Nevada millenniums which are stored in two seperate albums--the other millenniums are mixed in within the appropriate casino.

I keep my traders in racks spewed all over my office along with the chips to be catagorized in albums.

By the way, someone one asked about the prices of supplies. I pay $2.50 for 100 2x2 cardboard flips, $0.50 each for the plastic binders sheets (2x2 and 20 to a page) and between $0.60 and $1.00 each for the 1" binders when they go on sale at our local Staples, Office Max or discount store. I like the 1" binders because they are easier to handle with between 5 and 8 or so pages in each binder.