Question:
I use one of those "magic wallets" . I guess it's technically a bi-fold.

Answer:
a lot of fashionistas like comme des garcons wallets they zip all the way around there are knockoffs on ebay from hong kong you can get for cheap or for free by paying then making them refund your money for a fake then demanding shipping to return them. It'd be nicer to have a real one or a real nicer wallet the knockoffs are a classic structure and all but the leather is tough and the zipper is cheap. I like a wallet with a built in compartment for change. sometimes I use a skinny one if I'm getting dressed up though or even this leather id holding sort of thingie attached to a key ring you can also stuff a few bills in which I got at H&M, when a big wallet would screw up the lines...

Answer:
Sorry to bump an old thread.
I prefer using a front-pocket wallet. They are usually 4"x3" or 4"x2.5", very thin. Don't go for traditional bifold front-pocket wallet though, they just don't look right for a grown man. The one I'm using right now is a bit larger but I like the design, and nappa vitello leather from Bosca is sooo soft:
It looks like I can't post a url yet because of my newbie status, but Bosca nappa vitello leather front pocket wallets can be found at ebags.com.

Answer:
Brown leather bi-fold that has bad mother fucker embriordered in big bold black letters on the outside. Right out of pulp fiction.

Answer:
Cool wallets? J FOLD wallets. Have 2 of them. www.jfold.com