The Sydney Observatory experiments with astrotagging (previously discussed on Best of 3 here)
Mia Ridge blog notes from Clark Shirky's recent talk at the ICA, "Mass internet collaboration".
The name of William Crowley's Museums suck blog has set off an antagonistic response in some people, but the content is definitely worth a look.
Bruce Sterling's talk at Webstock has created a lot of controversy within the web community. Me, I wonder what art historians would have to say about his treatment of Art Nouveau: "Art Nouveau was not a success -- it had basic concepts that were seriously wrongheaded."