I've solved the wallet thing for myself, I've got the perfect wallet for me. So whenever someone comes out with a new ultraslim wallet, I'm unmoved. But I just gave the Silo Mesh Card wallet a gander and am impressed at the thinking that went into it:
It was designed by Sydney-based Silo, "a small collective of designers and design enthusiasts," who successfully Kickstarted the Mesh last year and subsequently won two Sydney Design Awards with it (In the "Best Startup" and "Product Design - Personal Use" categories.)
I love how minimal they've gotten the thing. In terms of form follows function, an elastic material is the perfect choice for an object that will shrink and grow in depth. I also dig the utility they've added with the opener and stand.
That being said, I still wouldn't switch, just out of personal preference. In order to use the bottle opener and stand I'd have to take the cards out, and knowing me, I would eventually lose something that way. However, I'll have to continue to open beers by slamming the caps off on my friends' counters when they're not looking, and I've got no RFID blocker. Pick your poison I guess.