Del.icio.us ... but pavlova is better ....

But Del.icio.us has been OK too. I managed to set up the account OK, make a bookmark and migrate it to Twitter. With minimal tags bundling was not an option but I did find the relevant section of Del.icio.us. I even clicked on Linkrolls and Tagrolls but wasn't game to actually try and activate one of them. I subscribed to "Iceland + travel" thinking that would be reasonably esoteric but came up with 21,142 bookmarks so cancelled that one post haste. Either the spaces were a problem or else that just sums up how unwieldy Delicious bookmarks can become. Subscribing to "nswlearning2.1" brought up a much more manageable 18 bookmarks. Searching Del.icio.us under a general tag like "libraries" is a waste of time - the more specific one got (e.g. using the maximum four tags) the more useful it might be but limiting the search to a specific user pool would be more efficient.
I don't use Delicious at all, but if I did and was part of a Twitter group sharing the bookmarks to Twitter would be very useful (personally and professionally), and bundling tags would be essential. Bookmarking combined with Twitter alerts would be particularly useful to specialist librarians and researchers.
In the Web 2.0 course I made the following comments about Delicious and in the absence of additional insights repeat them here .... "I think social bookmarking such as Del.icio.us offers could be a great resource for libraries and their clients. Adding to a Favourites list soon makes that so large as to be unusable whereas the grouping/bundling of tags is a logical and easy way of managing links to multiple sites.
"The fact that the bookmarks are public means that a del.icio.us account becomes an online virtual-world equivalent to the old subject card catalogue. Library members can access a range of sites which come with the library's implicit recommendation as a reliable site sorted according to broad subject labels.
"In a regional/joint library situation different libraries/individuals could be assigned to different subject areas so that the burden of setting up what is akin to a subject index was shared. Or maybe something like the old Subject Specialisation Scheme but instead of collecting and managing books in a subject area libraries collect and 'manage' sites in a subject area, making access to them available through social bookmarking. I guess even now smaller libraries can 'piggyback' on the published tags of larger libraries, e.g. the Sutherland Shire Libraries tag cloud.
"A Library Journal article on the advantages of social bookmarking and tagging pointed to advantages for both patrons and staff. For patrons there was a greater accessibility to resources. Using the tags as links one can do all one's research from one's own home computer. As well having publicly-defined tags means that local terminology can be incorporated, terms that have been used in locallly-set assignments, also terms from other languages. The inherent risk of substandard as opposed to nonstandard tag terms could be overcome by having tags that broadly conform with the Library of Congress subject headings and would be entered by the library, tags that are judged by the library staff to be of local relevance and tags generated by users. Library staff could use Del.icio.us to add links to items of particular local relevance and resources for local students' assignment topics.
"For staff social bookmarking makes creating subject guides easier. Looking at what other people have bookmarked facilitates the task. No-one can find even a percentage of the useful sites in a subject area but sharing discoveries is of benefit to all, library staff as well as users. Bookmarking and 'bundling' also provides reference staff with a set of useful sites they can turn to immediately just as they would have looked to the index of an encyclopedia set in an earlier age. Once some librarians had card indexes of good sites but with the number of sites ballooning exponentially this is no longer a viable option. It is likely that users will also advise of sites they have found useful and they can be incoporated after checking to the benefit of all."
I am most unlikely to ever use Del.icio.us outside of this course but I can remember being quite struck by its potential when I first encountered it in the Web 2.0 course.