Social bookmarking entering mainstream?

The November 22 edition of PC Magazine takes a look at what it describes as "community search engines", including del.icio.us (which by the way gets a poor score). For IRCworlders who are wondering what social bookmarking is all about, and enjoy the PC Mag style of comparing products, this article, "Never Search Alone" by Rick Broida, may be worth a quick glance. An indication that this type of online collaboration may be entering the mainstream?