I tried to find a source download option matching the latest IT OS 2006, but I could not find a one-stop HTTP download on the Maemo download page. I decided to take Nokia up on its written offer to provide the source code to the parts under the GPL and the LGPL.
My request was processed in a very timely manner. (Thanks Nokia!) Still, to save others the trouble of requesting the source, here are the contents of the package called “2.2006.39-14-srcs”. (It would be really nice if these were on maemo.org.)