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1) A New Document Depth Limit in Result Restrictions Section
You can now limit to the directory level where search term(s) are found. The limit finds material above, below, or exactly level one (the home page) to the 10th level directory of a site.
2) A New Embedded Content Section
Possibly. But so is using "+red +widgets" on Google.
The file type inclusion/exclusion selection is almost exactly what I suggested in the most recent feedback thread started here by GoogleGuy. Looks like the competition is watching... ;)
As far as I am concerned, alltheweb is the only serious alternative to Google/ODP at the moment, and their advanced search features contribute a lot to that fact.