I have been using the new del.icio.us firefox extension for days. And this saved two link button in my link bar. I don't use the toolbar which was released months ago, because my screen is small.
The best feature in this extension is the "Tag this link" context menu. A lot of time, we read posts in aggregators, like bloglines. Now with this feature, we don't have to load the page just for tagging. I have been dreaming for this for a long time.
If you haven't install the new extension,
go get it. I haven't got the final version updates in firefox yet. Did anyone get it?