It's long overdue, but the 1.0 version of my python library for parsing/manipulation of GPX files (gpxpy) is out. It contains too many changes to list them here, but it can be summarised as: gpxpy now supports both GPX 1.0 and 1.1. formats.
The 0.* version started as a utility scripts for me, it supported only some fields GPX 1.0 and I was adding more as users requested. But with time, as GPX 1.1 started to be used more, it became difficult to follow what's exactly missing in the library. People requested featured from different versions of GPX but the library nominally supported only 1.0.
After a couple of months of complete refactoring of the code to parse/serialize GPX file the new version is out. There is only one thing missing -- support for GPX 1.1. extensions. This will (probably) come later.