on my livesite it works and is a nice web2.0 addition for J.
btw. I can not follow the other reviewers opinion
- concerning opensef-imcompatibilies: why should sef influence external links? (which del.icio.us-links are). I am using opensef, no problems with this module.
- layout: as usual with many mods it seem to depend on certain templates. in mine I see no bleeding, and also as usual there would be - I do not use it - the chance of an extra css-class.
I miss a bit: caching options, but del.icio.us sends really just a small amount of data, so maybe not that crucial.