Emre Sokullu pointed me to an interesting post by Ari Paparo, the founder of Blink. Blink was a VC-backed bookmarking service, which eventually failed. He contemplates Blink’s decisions in light of del.icio.us‘s success.
We had more money, more users, a five year head start, and some really,
really smart people working on bookmarking in 1999. The bottom line is
that we simply didn’t get it right. Some simple innovations like using
tags instead of folders, making public the default, building better
discovery features, etc made the difference between being an also-ran
and a hot acquisition target.