Is it possible view all bookmarks that I have only visited once or
twice? Or ones that are over a year old? Maybe even bookmarkes that
are over a year old and have not been visited?

Since starting using delicious my bookmarks have jumped from about 400
to over 1200, the first 400 took me years to accrue in Internet
Explorer, but I new what bookmarks I had and where they were.

In the last few months I have given up trying to use bundles, and just
search for what I want. Now I want to get rid of old or unused
bookmarks. Is there a way of doing this? I thought about starting a
new account, but I don't want to have to do that if there is an easier
way.