Siderian Ventures
Venture partner at Siderian Ventures, seed investors in sustainable businesses.

Wists
(Massive caveat - I'm an architect but I can't lay bricks. Similarly, I'm a UX guy but built Wists, largely myself, to learn to program. It's old, pre-Ajax, and it sucks UX wise, it's a mess because I had to switch off half the functionality to make it scale - so it's as if I'd built a brick wall myself, rather than just draw it - but the design concept was sound and people still use it. However, Pinterest have built a visual bookmarking system largely as I would have designed it!)

Wists was the first service to develop the concept of visual social bookmarking that has become popular with Pinterest and Tumblr. Launched around the same time as Delicious, the difference was that each bookmark automatically created a thumbnail from a image of your choice on the page you were bookmarking. The idea is that you could create a wishlist of things you might want to buy, not tied to any particular service, such as Amazon.

Yelp
I helped co-found the incubator MRL Ventures, led by PayPal founder, Max Levchin. My remit was 'local' and when we realized how big the Yellow Pages market was and how bad these services were online, the opportunity seemed pretty simple. I was involved in the early days of Yelp and chose the name, among other things, but left the incubator to go to New York before it was spun out as a separate company.

Moreover.com
Moreover was the first Internet news search engine, powering Altavista, Yahoo, MSN and sites like the Economist. After Altavista received tons of traffic to its Moreover powered news during 911, Google decided to create Google News. I founded it with Angus Bankes and Nick Denton (who went on to create Gawker Media). We sold it to Verisgn. My favorite application created at Moreover was Newsblogger, which we did with Evan Williams who later went on to do Twitter.

Origins.net
The British and Irish genealogy service, Origins was the first website to provide access to UK government data. It was profitable within its first year of operation and is still going strong.

RSS 1.0
The history of RSS is somewhat arcane and often misundestood, suffice to say its not so much a standard but a meme and that Dave Winer deserves most of the credit. The main contribution from RSS 1.0 was the idea of modularity.

RSS Ping
RSS ping is a standard I developed with Wordpress creator, Matt Mullenweg, that never really took off but the concepts apply to what's now called the Realtime Web, the idea was to extend weblog ping mechanisms to say adding information about exactly what has been updated or published.

One Line Bio: personal headlines, RSS for people
Many of the most useful innovations on the web such as permalinks or the reverse chronological list have been seemingly trivial. with one line bios I tried to create the equivalent of news headlines for people, so that they could be simply disambiguated (John Doe, car mechanic, Michigan is different from John Doe, Lion Tamer, Nebraska). Today they are used by more than 500 million people after Six Apart then Twitter and the Facebook adopted this trivial, but still necessary step in web conventions. Anil Dash did a nice write up of one line bio's, here.

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