You’re a developer. Your dream is to impact an insane number of people with your work. And you’re impatient — you don’t want to start small, dazzling just a few people with your coding wares.

Enter the Yahoo! Open Strategy (Y!OS). Imagine a world where you can write code that will meaningfully reach millions of users in a single bound. That’s the promise of an open Yahoo!.

Ari Balogh, our new CTO, just offered a preview at Web 2.0 Expo of a very new kind of Yahoo!. One that invites developers to take advantage of our huge scale to write applications that build on our existing properties (think Mail, Sports, Search, our front page, mobile, My Yahoo!, etc.), tap into millions of loyal users, and make Internet experience more relevant and useful. You’ve heard us hint at this for a while and now it’s right around the corner.

Think about it: Yahoo! serves more than 500 million unique users every month. We serve 120 billion page views per month. Yahoo! users spend 235 billion minutes a month on our sites. More importantly, some 10 billion relationships exist on user buddy lists and in Yahoo! address books. All that represents a mind-boggling audience for developers.

There’s a massive, latent social network within Yahoo!, and we’re going to bring it to the surface. We’re making Yahoo! more social, but we’re not building yet another social network. We already have an incredible social network… we just need to unlock it.

We are rewiring Yahoo!, building platforms that fundamentally change how Yahoo! works. We’re also opening up to developers to take advantage of the social aspects of our many favored destinations, creating what we call “vitality” — a lifeline into what’s happening with your social connections We plan to become open the best platform on the web, where tens of thousands of developers will create applications and features (many we’ve never even thought of) for our network and our consumers.

Of course, lots of Internet companies are on the “open” bandwagon. In fact, the bandwagon is getting pretty crowded (I’ve never actually seen a bandwagon, but go with me on this). Yahoo! has been in the “open” camp for years, starting simple with RSS feeds in 2003. And now Flickr is the second-most popular API on the Web. We’ve also been a leader in industry’s efforts to embrace open development.

A first taste of our strategy is SearchMonkey, which will let developers mash up helpful data with our search engine results. A Japanese restaurant would no longer be a simple link. Instead, it could include a photo, address, ratings, reviews, and links to online reservations. Search Monkey will be available in a few weeks. Make sure you come to our launch party on May 15th.

And it doesn’t stop there. Y!OS will let developers make Yahoo! portable so that everywhere you go, a more relevant, social and useful online experience is available to you. Shopping on a third-party site? Why not have instant access to your Yahoo! Address Book? I know I want it! ;-)

We’ve previewed Yahoo! OS with leading development shops and they’re very excited to do their thing on Yahoo!. In fact, they plan to dedicate a lot of resources to this platform. It all comes back to the size of the opportunity, right?

Today’s just the beginning. There’s plenty more to come in the months ahead!

UPDATE: Here’s a video of Ari’s Web 2.0 Expo keynote from this morning.

Neal Sample
Chief Architect, Platforms