I suppose for those who have any glimmer of interest, inkr is back up and taking closed beta registrations. Though it seems to be a far cry from the original concept.
Apparently Inkr is still in progress, but the sites url just redirects to the Inkr Twitter account. I have no idea why I still keep up with this, but I do.
About 3 weeks ago, I heard that it's making good progress. They're supposed to begin launching inkr in the fall, so we should expect to see something soon...