del.icio.us was a social bookmarking site, i was a user back then for a while. While there were similarities, it didn't aggregate content per se. and was solving a rather different problem.
As described, k-Collector seems to be solving a subset of the problem space that delic.io.us did. kConnect presents feeds of different blogs grouped by tag, while delic.io.us did the same, but for all websites, not just blog posts. What am I missing?
It sounds like a really interesting experiment, is why I'm so interested. Are you sure it can't be revived?