Ken Clark has an interesting list of 11 ways you can use Del.icio.us and other social bookmarking sites to get things done. For example,
Read / Review – When I come across web content that I do not have the time to read, I tag it with @readreview and move on. I review the @readreview list as part of my daily or weekly reviews and then remove the tag once it has been read.
I do something similar with e-books I’d like to read offline. These days it seems like everyone is putting their novel or short story collection as a CC download. Typically I run across links to these when I don’t have time to actually go download the file and transfer it to my Sony Reader so I simply bookmark it with an @download tag. Same thing with MP3s I want to go back and download later. Then I simply remove the tag once I’ve gone back and downloaded it.
Most of the ideas Clark has can easily be adapted to different contexts and purposes, and is well worth reading in full.