You can still access my public delicio.us bookmarks if you want them. I will miss the service, as I miss Google Wave.
I tried several cloud based to-do and getting things done style web sites but ended up writing my own my-foc.us web app but left the door open to other people by releasing the app as open source. I used ran the online kbsdocs.com word processor for a few years but made sure to provide data export options.
People and companies who provide free services have no real obligation to continue the services forever but they have a responsibility to give users a good exit strategy. I exported my delicio.us bookmarks and I suggest you do the same.