Just wanted to say that I've only just come across the pecl_http extension and I wanted to say that I think it's ace! I do a lot of ReST based PHP work, and I spent ages building what was essentially a PHP version of your extension, so I was super-happy to find your extension has done most of the hard work for me! So thanks!
I always though that PHP http features were a bit 'unusual': I personally HATE the $_GET, $_POST magic variables, and have found that working with HTTP in general in PHP to be a ball-ache, though it is getting better (the streams support is pretty wild, and I'm digging it).
Anyways, this was just a quick note to say keep up the good work dude!
P.S. I've been using the pecl4win pecl_http.dll at work to test with, but when I built the latest and previous versions using phpize on OSX Tiger, I got an error and Apache refused to start. I raised a bug issue on the pecl site. Let me know if you need any more information.