Before first release:

* Support digest authentication
* Better header parsing support including quality ratings.
* Combining headers.
* A real public interface that people who aren't smoking crack like
me and don't case about the internals of HTTP can use.  This
means a real http user agent that automatically handles
redirects and whatnot.
* Support for byte ranges
* Support encoding strings for posting as "forms"

Blue sky:

* Support SSL
* Support Content-MD5 for sending and recieving entity bodies
* Support gzip and deflate content encodings