On Web bookmarking

The use cases I need for a web bookmarking application are:

• Quick button or key combination to bookmark an URL.
• Review bookmarks for obsolescence. Each bookmark should be checked periodically to find if the resource still exists and have a notification when it does not exist. Bookmarks should have attached a review date to be able to review bookmarks one by one.
• Retitle bookmarks. (Many times the title on the page is not the one I want)
• Classification. I do not like hierarchical classification because many bookmarks may own to more than one category and hierarchical classification can only have one folder structure. (Example: low fat meals/fish or fish/low fat meals) (tags also have problems as it is common to tag an AJAX tutorial as "AJAX,JavaScript" but AJAX already contains JavaScript implicitly on it but I want to get that page when I look for the broader term like JavaScript resources)
• As bookmarks refer to online resources they may only be accessed online, but I still need transparent backups in case the online resource that hosts my bookmarks accidentally removes them or just disappears.
• Pending revision. I sometimes see something that I need to review but I still do not want to publish in my public bookmarks.

I am currently using delicious.com to host my public bookmarks, but that solution alone lacks reviewing and quick bookmark saving (unless you use the fat Firefox plugin).

Social Bookmarks Friend Finder (for delicious.com)

I am quite interested in social networks as they allow you to get in contact with people with similar interests.

I found some time ago a social bookmarking site called delicious.com that allows you to have all you public bookmarks tagged. I liked to find similar users to me but the site had no option for that and I found Find Similar Users on del.icio.us but it had some problems like excessive memory usage, no continue and the need to provide user and password to access the data. So I developed a similar Java program without those problems called Social Bookmarks Friend Finder (for delicious.com). It is coded in Java, using the embedded H2 database by default (being able to use most compatible JDBC databases). Please try it if you want and report any issues. I would like to hear if it was useful to you!