Most of the time I prefer my cash separate from my wallet (wallet being my Id and various cards). I either use cash or card, I never need both, and it seems like I have more security over my personal info. This is a good option if you only have a few bills: http://stores.ebay.com/cherish-lamb
Of course, you could improvise this setup with your own slim wallet and money clip.
I've been front pocket carrying this wallet for the past month now. I wanted the smallest wallet I could get that would still hold my stuff secure on the inside with an outer pocket for quick access to my work pass. I'm happy with it.