Tag drill-down (offering proper tags to narrow the search)
On Delicious I loved their tag tree, where I could "expand" the entered tag to see which tags can I use to narrow the search. So even when I did not remember how exactly I tagged the item, I could enter some generic tag and see which other tags I used to distinguish it.
Would be nice to have sth similar on Diigo.
It would suffice if - after I entered the first tag in the filter - Diigo offered list or cloud of related tags (those tags which are present on some pages bookmarked with the first tag).
i like the idea of TREE categorisation, but it should be for CATEGORIES, not for TAGS, as they are just plain 'keywords'
Yusuf Tran commented
I think this is now implemented with 'Related tags', you can add / remove to help filter the results