Here’s the latest action:

openid.bmpOpenID is gaining groundOpenID is a service that lets you use your URL as your username anytime you have to login to a site that requires username and password. Until now, it has been slow to catch on — Web sites have taken their time to allow it. But an increasing number of sites are doing so, because it’s convenient for users. Here’s how it works: You use the URL as your username as you sign in, and this triggers a request by the site to obtain your identity details that you keep safely locked up another site (your so-called provider). More info here. Microsoft recently said it will support it, AOL is now supporting it, and now Digg is too, among a long list of others.

ruptureimage.bmpShawn Fanning’s new company, Rupture, goes live — The site allows gamers to network and maintain profiles based on the game World of War Craft (we reported on Rupture here). Let us know what you think.

Startupping, a site for entrepreneurs — Mark Fletcher, a successful entrepreneur, has started a web site for entrepreneurs, Startupping.com — allowing them to trade tips, resources, etc. Fletcher, you’ll recall, successfully built and sold two companies: eGroups (to Yahoo) and Bloglines (to Ask).

Trulia releases housing API Trulia, the online real estate company, has opened its API so that anyone can build their own home price forecasting tool, heat map, or application comparing home prices and other variables. We’re not sure how widely useful this is, but there are some interesting stats emerging, such as how people pay less for homes in areas where there are more women and how more foreigners mean less crime.

Odeo, podcasting service, looking for home — This the saga that won’t go away. San Francisco entrepreneur Evan Williams bought back his podcasting company, Odeo, from investors, but has now focused his energies on an SMS service spin-out, called Twitter. So now he wants to sell Odeo, which has a respectable 3 million monthly page views, and breaking even on adsense. Notably, he asks whether there’s a marketplace where he can publicize the sale. We can point him to our very own VentureBoard, launched not long ago. Recently, SupportMagic listed itself and an investor saw the listing, and bought it. (The board’s most recent listings get mentioned on our home page.)

EU commits to halt greenhouse gas emissions, while US commits to increase them — Here’s the story on progress by the European Union countries to commit to lower greenhouse gas emissions, which has yet to be ratified by the individual countries. Too bad that the U.S. is standing still. Already the biggest polluters, we’re planning another 150 coal plants over the next few years to meet our growing energy needs, and have no agreed upon way to capture the resulting carbon dioxide before it spews into the air. Meanwhile, North Pole is seeing record levels of greenhouse gas.

Confabb, the conference social network, sells? — Rumor, at Techcrunch, is that Confabb is being acquired for $5 million or so, after just three months’ work. Not bad at all for founder Salim Ismail, who’s last company PubSub didn’t do too well. Confabb’s angel investors include Dave Winer and Andrew Rasiej.