Important API Updates and Changes
Today we’re making some 
important announcements  on the transition of our Search back-end infrastructure to Microsoft,  and how this transition impacts the Search APIs and web services we  offer on the Yahoo! Developer Network. We are also sharing specific news  about several of our other developer services. 
Over recent years, Yahoo! has made a commitment to developers by opening  products, services, and canvases for third-party innovation. This  commitment remains unwavering. For example, we recently announced 
new canvases and APIs as part of our Zynga deal. At the same time, we have to align our developer offerings with our products and strategy.  
Yahoo! Search BOSS
Search remains critical to Yahoo! and we’re happy to announce that we will continue to offer the 
BOSS program (Build your Own Search Service).   In the not too distant future, BOSS will provide web and image search  results from Microsoft along with other search-related services and  content from Yahoo!, such as news. In the next 30 days, we will announce  the specific details about how BOSS will evolve. We are exploring a  potential fee-based structure as well as ad-revenue models that will  enable BOSS developers to monetize their offerings. When we roll out  these changes, BOSS will no longer be a free service to developers.
To all the current users of BOSS, we appreciate your patience as we  continue to work through the details. We know BOSS is important to your  business and we promise to give ample notice before we change any usage  terms. In addition, Yahoo! plans to deliver new search-related offerings  to publishers in the coming months, and we will share those details as  soon as they are available. 
YQL (Yahoo! Query Language)
As described back in April, we are 
moving to YQL-based services wherever possible. This has long-term benefits for developers: 
YQL  is reliable, scalable, cloud-based, and easy-to-use. YQL eliminates the  need to learn multiple APIs while providing the same functionality. We  are also preparing to roll out a new commercial program for developers  focused on our social platforms and YQL.  
YQL is a key element of Yahoo!’s infrastructure – it’s the way that the  Yahoo! Homepage, Search, and other high-traffic, global Yahoo! products  get their data. We rely on this technology and we’re committed to making  it scalable and continuously available for you. 
Several search-related  web services will continue to be supported, but strictly through YQL. These include the 
Yahoo! Term Extraction Web Service, 
Related Suggestion, and 
Spelling Suggestion. Other non-BOSS search APIs such as 
Web Search, 
Image Search, 
News Search and 
Site Explorer APIs will shut down with no further support in YQL. We plan to make these transitions and shutdowns effective by end of year. 
SearchMonkey
On October 1, 2010, we will close the 
SearchMonkey developer tool, gallery, and app preferences. 
Yahoo! Search is continuing to shift  from a model where developers build lightweight apps to install on  Yahoo! to one where publishers enhance their own site markup to produce  similar results. Yahoo! Search results pages will continue to show  enhanced result templates from websites’ page markup and structured data  feeds along with Microsoft’s organic listings.
Site Explorer
The 
Yahoo! Site Explorer  team is planning tighter integration between Site Explorer and Bing  Webmaster Center to make the transition as smooth as possible for  webmasters.   At this stage in the transition, it is important for  webmasters to 
continue using Yahoo! Site Explorer  to inform us about your website and its structure so you keep getting  high quality traffic from searches originating on Yahoo! and our partner  sites – even from markets outside the US and Canada that haven’t yet  transitioned to Microsoft systems. To keep things simple, we will share  site information you provide on Site Explorer with Microsoft during this  transition period.
When Microsoft fully powers the Yahoo! Search back-end globally,  expected in 2012, it will be important for webmasters to use Bing  Webmaster Center as well.  The Bing tool will manage site, webpage and  feed submissions. Yahoo! Site Explorer will shift to focus on new  features for webmasters that provide richer analysis of the organic  search traffic you get from the Yahoo! network and our partner sites.
Maps, Geo, and Local
Location-based services are an essential element in web app development.  We will be evaluating all our Geo, Maps, and Local APIs--updating or  shutting down some of them, and working with our strategic partner,  Nokia, on others.  We will work with our developer community to ensure a  smooth transition in all instances and we will share more details about  these decisions in September.
MyBlogLog
The 
future of MyBlogLog has been uncertain for some time, as we discussed back in December. The day has come, however, to shut down the 
MyBlogLog APIs.  By the end of the year, these APIs will no longer be available. We encourage you to  turn to our well-supported 
Social APIs.  The Yahoo! network now relies on this Social platform to power user  profiles and social graph, relationships, activity streams, and more.   
The Web has changed a lot since 2005 when YDN launched as the home for  Yahoo!’s Search APIs, and so has our business. We know you’ve built  amazing products atop our technology stack and we will do our best to  provide the greatest transparency and smoothest possible transition.  
We will use YQL as our core foundation for APIs moving forward, and stay  focused on making good, valuable data open and accessible to  developers. We will continue to share key technologies, such as  front-end libraries like YUI and cloud services like Hadoop and Traffic  Server.