Yeah - Yahoo! could certainly use some Welchian / Michael Porter strategic sense. The problem is that Google needs to do that too. That's why I think they should sell Flickr to Google - it's a much better fit for Google than Yahoo!

Delicious is a dog - I don't use it any more. To be fair, I don't use Digg, Reddit or StumbleUpon either. I get my traffic from Twitter, DZone, Reddit Programming and here.

Upcoming is an interesting situation. We use it here in PDX for some things, but we have our own local event calendar, Calagator.org. There's also Meetup.com and Eventbrite and Facebook calendars. I'm not sure anyone really owns that space, but at least Meetup has a revenue model.