in regard to C standard, third party libraries and operating systems etc.

  All boolean options (such as -O, -I, -v etc), both short and long versions,
  now always switch on/enable the option named. Using the same option multiple
  times thus make no difference. To switch off one of those options, you need
  to use the long version of the option and type --no-OPTION. Like to disable
  verbose mode you use --no-verbose!

- Added --remote-name-all to curl, which if used changes the default for all
  given URLs to be dealt with as if -O is used. So if you want to disable that
  for a specific URL after --remote-name-all has been used, you muse use -o -
  or --no-remote-name.

  OpenSSL, NSS and GnuTLS-built libcurls.

  OpenSSL, NSS and GnuTLS-built libcurls.

  curl_easy_getinfo. It returns a pointer to a string with the most recently
  used IP address. Modified test case 500 to also verify this feature. The
  implementing of this feature was sponsored by Lenny Rachitsky at NeuStar.

due to KfW's library header files exporting symbols/macros that should be
kept private to the KfW library. See ticket #5601 at http://krbdev.mit.edu/rt/

to curl_easy_setopt instead of long.

to be more descriptive and finally set VERBOSE mode to 1 by default

  and receive data over a connection previously setup with curl_easy_perform()
  and its CURLOPT_CONNECT_ONLY option. The sendrecv.c example was added to
  show how they can be used.

This also implies the removal of the winmm.lib dependency for WIN32.

http://curl.haxx.se/mail/lib-2008-04/0443.html

  redirections and thus cannot use CURLOPT_FOLLOWLOCATION easily, we now
  introduce the new CURLINFO_REDIRECT_URL option that lets applications
  extract the URL libcurl would've redirected to if it had been told to. This
  then enables the application to continue to that URL as it thinks is
  suitable, without having to re-implement the magic of creating the new URL
  from the Location: header etc. Test 1029 verifies it.

example programs.

  application to provide data for a multipart with the read callback. Note
  that the size needs to be provided with CURLFORM_CONTENTSLENGTH when the
  stream option is used. This feature is verified by the new test case
  554. This feature was sponsored by Xponaut.

normal build/install (only with the 'make check' target), so that a
build failure in the examples isn't fatal.

functional if libcurl is built against OpenSSL