pynmea version 0.6.0 has just been released over at google code and is also pip installable.

Major changes are the addition of a NMEAStream object that allows files to be streamed in, and either a list of nmea objects or nmea sentences as strings returned. This should make it much easier to develop NMEA / GPS applications without the hassle of having to parse the input to and output from the library. There is now also some documentation and an example for the basic usage of the library. Hopefully the examples and documentation will grow as the library itself becomes more mature.