I am fascinated by APIs. I got to listen to the engineer from Mashery talk about their API services the other day. Ever since then I've been thinking a lot more about APIs. I just reviewed 25 top APIs out there:I've been looking at each providers approach to delivering an API ecosystem. Lots of different approaches and common building blocks.Google wins for the most simplest approach to deploying APIs. Salesforce definitely is the leader in delivering a very robust and complete API ecosystem, its no wonder they are the leading Software as a Service (SaaS) provider.