While they technically aren't blades, the Ping s59 at address has the same look as a blade. Thin topline, almost no offset, tiny head. However, I find them to be almost as forgiving as the best cavity back. And from what I've heard, the s56 is even better.
I never played Pings and never really thought about them as an option. But the pro at my club a few years ago was upgrading to the s58, and he sold me his s59's for cheap (we have the same build and swing, so they fit me perfectly). I've never been happier with a set of irons. I swapped out the 3-iron for an Adams Pro hybrid, but that wasn't because the s59 3-iron was particularly difficult to hit ... more a case that the Adams hybrid is brilliant.