Moniker now uses the SnapNames platform. I think that SnapNames only sells .com, .net, .org, .info and perhaps .biz - no cctlds. I think you also need to have your domain at Moniker to use the service.

There are pros and cons. SnapNames seems to have a dedicated group of buyers who don't buy elsewhere - so you get the opportunity to put your domains in front of a different set of eyeballs. The process of a sale is very smooth - unlike with most other sites. You can start an auction any time, the auction lasts however long you want it, and can have any reserve.

On the other hand, the commission is 20%, which I think is pretty high. Also, your domain gets lost in a large crowd - they don't have a very intuitive interface, and it almost seems like luck if your domain gets noticed. Finally, I think that they ask for an exclusive listings - so while your domain is listed there, you can't be selling it elsewhere.

All in all, it's definitely worth trying SnapNames.