Amaznode - Amazon related product search, results are presented in a visual network
Clutzr - attention network which records your click stream and recommends similar people, also see attenTV slifeshare. Also reminds me of a combination of Chatsum, Reko, and OthersOnline. [via mashable]
AuthorStream - slideshow network for your powerpoint presentations, basically another SlideShare, Scribd will host it but not as a slideshow widget, an online storage service like Box will also host it for you, and OPML Workstation will convert a powerpoint file into an outline widget.