Feature request:
Well its more of a general request.
I have moved from Delicious to Diigo because delicious largely stopped working for me.

The Delicious bookmark sidebar offered a MUCH superior experience due to it sychronising with the local machine.
I would love to see some of the Delicious features replicated:
1 spilt bar into results:tags and results:bookmarks when searching
1 allow multi-tag filtering (filter by tag a, drill-down by tag b)
2 Cursor snap to sidebar search bar as soon as it opens (ctrl+b)
3 right-click on a bookmark to reveal options

Another idea: fall-back when other apps are using crtl+b (eg making items bold on Google Docs)

thanks, love your work!