I was thinking in the same thing But maybe i find the answer...

In the Google Data APIs Protocol http://code.google.com/apis/gdata/protocol.html you can read this...

"This document doesn't rely on any particular programming language; you can send and receive GData messages using any programming language that lets you issue HTTP requests and parse XML-based responses."

And now i read more slowly the Using the Blogger Data API http://code.google.com/apis/gdata/blogger.html also you can see "If your client is written in another language, see the client library documentation for that language, if available (see this page's navigation bar for a list of client libraries); you can translate the examples in this document into other languages as needed."

This means only the examples are in Java, and you don't have to be forced to learn Java (i love PHP too much to learn something else)

All of us can )including me) can take a little time to read the whole thing... i'am use to just see the examples (is the easiest and rela way to learn), and don't read the "disclaimers"...