The first thing I'm noticing people asking is why use delicious instead of saving bookmarks in your browser? My answer to this is that it's not 'instead of' - I still have favourites saved for the sites I go to most frequently, and in many cases don't have these saved on delicious at all. Delicious, for me, is more like my web library - all the things I've read on the internet that I want to save for future reference, or just in case, or because I don't have time to read them just yet but want to come back to, or just because I thought they were good/interesting/entertaining etc, as well as all the sites that I don't visit that often (and so don't want to have cluttering up my browser bookmarks), but do want to be able to find quickly and easily on occasion. It's therefore full of individual articles and pages rather than whole sites - links to specific things like YouTube videos, short stories, reviews, comic strips, articles, blog posts, picture galleries, fics, forum posts... you get the picture. It's also, as I talked about in my previous post, a really useful discovery tool, but for this kind of thing - not whole sites, but for what is being talked about and produced on the web. I suppose, to continue the library analogy, it's like my browser bookmarks are my quick reference section, whereas my delicious page is my whole collection.
The idea of delicious as a discovery tool has also perplexed some people, with complaints about volume/quality of information etc. To be honest, my initial answer to this is 'in what way is this different or worse than Google?', but fellow 23er Laura has addressed this concern excellently in her blog, so I will say no more and refer you to her!
Finally, this week's things have really introduced the idea of tagging on a mass scale, and the concept of folksonomies. I found this excellent article by Clay Shirky saved by someone with the ox23 tag (via my Google Reader - see what I mean about delicious tags as a resource discovery method?), which explains why classifying the web in a traditional sense doesn't work, but tagging does. And secondly I'm going to embed a really good presentation here by Tim Spalding (founder of LibraryThing - another site that uses tagging heavily) wherein he explains the benefits that tagging offers as compared to library classification schemes like LCSH. It's a really thought-provoking talk, and while I'm not going to be a complete traitor to my profession and advocate throwing out LCSH completely, I do think that tagging has a lot to offer library catalogues as an additional feature. Of course, we have tagging functionality in SOLO, but as both Shirky and Spalding point out, tagging only works if a critical mass can be achieved, and SOLO is nowhere near there yet!