Would you tell about some other projects that you did before delicious? Not necessarily their names, just roughly what they were about. Basically I'm curious whether there was a logical succession or were you just trying out random ideas.

This is taken from Founders At Work, which you should buy (it's great!):

Bookbook - Schacter never came up with a name for this, but it's basically an XML file on your website where you would provide a feed and other people would do this and create a central crossing engine that would say, "You have this book and he wants that book, and you are not that far from each other."

Loaf - a fully distributed social network (no central server whatsoever ... yes, that does sounds like Diaspora). Uses email as a carrier, a bloom filter, and it basically tells people you talked to about other people you corresponded with 'in an encrypted and compressed way'.

Memepool - which was a blog of links (before people knew what blogs were, this was in 1998). So basically an editor with reader submissions - a link at the bottom saying "Send us an email. Give us good links."

Muxway - 2001, 'which was a lot like del.icio.us'. Only it was single player - Schacter could save links, and those links were public, and that was that.

GeoURL - http://geourl.org/

Reversible - a failed version of del.icio.us. It was 'different in a few key ways that made it fail.'

good list.

bring back memepool plz