Del.icio.us has me side tracked. I've collect my quota and now flouncing through other collections. My father is my recent Del.ico.us convert. Del.ico.us addictions have begun to run rampant among my friends; i'd compare it to the zombie application on Facebook, but there are no un-dead involved.
I've been poking around the other sites but haven't completed the quotas as of yet.
Zombies in Plain English :)