Club Scrap is a "club" that you subscribe to -- you receive a monthly shipment of goodies in a pizza-type box. There are different types of membership depending on whether you want 12x12 papers or 8-1/2x11 papers, and also whether you want a kit with all kinds of tools, embellishments, etc. or if you prefer to just get a box of their exclusive paper.
Each month has a theme. This month's is By the Sea. Next month will be Egypt (I have no idea what I'm gonna do with that! LOL). They will also offer a special kit to coordinate with DIY Network's scrappin' special in September.
You have to be a member to purchase most kits, but there are a couple that you can buy to try -- the current one is a beautiful wedding kit.