The mixin itself has no dependencies on the rest of peppy (only on
pyenchant), so should be fairly easily integrated into other projects.
You can see the source and download from:
http://trac.flipturn.org/browser/trunk/peppy/lib/stcspellcheckmixin.py
The stcspellcheckmixin.py file has a built-in demo as well. You'll
need to install pyenchant (http://pyenchant.sourceforge.net) for it to
actually spell check anything, otherwise the whole mixin is one big
no-op.
Rob