Disregard that useless “sticky” posting. The current API docs are here: http://www.blender.org/documentation/blender_python_api_2_63_17/
Note the new BMesh stuff. Some of it is still not clear (e.g. what is a “BMLoop” and what do you use it for?), but this rationale behind the underlying code design http://wiki.blender.org/index.php/Dev:2.6/Source/Modeling/BMesh/Design
should help a bit.