A user sent in a patch that fixed the MIMETYPES error we were getting with 2.0.15 and 2.0.16. It looks like python-gdata moved away from declaring MIMETYPES where we were calling them from, so now we name them explicitly in googlecl/src/googlecl/docs/client.py.
That was a great start, but then we started getting a DocsEntry error and uploads still wouldn't work, so we delved further. Here's the error we got after fixing the MIMETYPES problem.
AttributeError: 'module' object has no attribute 'DocsEntry'
One of our earlier searches brought us to the same error posted on python-gdata's buglist.
Then, we found this blog post, by Demon Lord, where they had success replacing the string "gdata.docs.data.DocsEntry" with the string "gdata.data.GDEntry". We tried that throughout the file googlecl/src/googlecl/docs/client.py and sure enough, that fixed it!
We tested 2.0.0 through 2.0.4 to make sure that didn't break anything for those users and then tested 2.0.12 through 2.0.16 to make sure it worked on all the versions that should be able to upload docs. It does so it's now been committed.