What are we going to use now? Most people will jump directly to diigo. I won't because I hate diigo - it's another example of Gresham's Law. Moreover, social bookmarking is dead. People want to squirrel, not to share, so I won't be investing time in another social bookmarking service.
So what do I now? In the short term, I'll be using Google Bookmarks, which is close to the functionality of delicious but with no social component or RSS anywhere (i.e. crap but reliable, and a nice interface - like delicious before Yahoo ruined it). In the longer term, I'm looking at cross-browser bookmark syncing, possibly with Xmarks (which now has a viable business model, but has not implemented delicious import after being nagged about this for months). And what do the rest of you do? Rely on social recommendation. Live by the Facebook, die by the Facebook.