Version: (using KDE Devel) Installed from: Compiled sources A hierarchical taxonomy for categorizing bookmarks is less than optimal. What about adding a native folksonomy facility to the local bookmarks. Once this were in place, providing synchronization via ioslave between the local and any one (or more) of a number of on-line folksonomy-style bookmark sites (social/public or private, eg del.icio.us) would be a logical, fairly straight-forward next step. If the folksonomy facility were made generic enough--a la an engine, it could be reused in many ways besides just html bookmarks--such as for tagging files (photos, music, etc) (one option, a slight paradigm/use shift, is to consider that all files can be represented as a url in the file browser--thus the file browser could abstract the file by it's url and allow tags to be applied to the bookmark for indexing, searching, sorting)
We tried this for KDE4 and unfortunately everyone hated it. :( Maybe it wasn't implemented properly or maybe it was just a bad idea in the first place. The world may never know. Either way, sorry, I don't think we're going to go down that route again. :)