On Mike's blog today, he has posted a tutorial ("kinda") for PECL/HTTP.

I've added a tiny tutorial, or sort of collection of usage examples, to the pecl/http repository.

You can read it in the extended post, or just check it out from CVS. Please note that the code for the XMLRPC client has just been put into CVS.

He gives eight examples of XMLRPC interactions, including: GET Queries, Parallel Requests, Chached Responses, a KISS XMLRPC Client, and a Simple Feed Aggregator.