Salmon Protocol — protocol to unite comments and annotations with original web pages. A distributed solution to the problem that Disqus tackles in a centralised fashion. Important because we’ll all be historians of our earlier lives and dissipated prolific micro-content is a historian’s nightmare.
Gephi — open source (GPLv3) interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs. I believe tools for data exploration, versus static infographics, are the only way to develop a new sense for data. (via mattb on Delicious)
Skinput — a bio-acoustic sensor lets you use your skin to write, tap, drag, etc. See also BBC article. (via Mike Loukides)