Misc
 - full URL syntax
 - custom maximum download time
 - custom least download speed acceptable
 - multiple URLs
 - guesses protocol from host name unless specified
 - uses .netrc
 - progress bar/time specs while downloading
 - PROXY environment variables support
 - config file support
 - compiles on win32

HTTP
 - GET
 - PUT
 - HEAD
 - POST
 - multipart POST
 - authentication
 - resume
 - follow redirects
 - custom HTTP request
 - cookie get/send
 - custom headers (that can replace internally generated headers)
 - custom user-agent string
 - custom referer string
 - range
 - proxy authentication
 - time conditions
 - via http-proxy

HTTPS (*1)
 - (all the HTTP features)
 - using certificates
 - via http-proxy

FTP
 - download
 - authentication
 - PORT or PASV
 - single file size information (compare to HTTP HEAD)
 - 'type=' URL support
 - dir listing
 - dir listing names-only
 - upload
 - upload append
 - upload via http-proxy as HTTP PUT
 - download resume
 - upload resume
 - QUOT commands (before and/or after the transfer)
 - simple "range" support
 - via http-proxy

TELNET
 - connection negotiation
 - stdin/stdout I/O

LDAP (*2)
 - full LDAP URL support

DICT
 - extended DICT URL support

GOPHER
 - GET
 - via http-proxy

FILE
 - URL support

        *1 = requires OpenSSL
        *2 = requires OpenLDAP