Tagpacker

Unlike other services, this allows the user to select a thumbnail image themselves.
This is of great help to read again later on.

The best way to replace delicious solution. User friendly and lot of personalisation, it's the best solution to bookmark web sites. Tagpaker is a real free solution.

Ability to tag links, open multiple links at once, save links using browser button.

[Edited by niclasdaniels, August 31]

However, the lack of Android app makes it less useful when switching devices than other alternatives I think.