Add a new f2py example that uses F90 (it's still very simple).
Add agenda for 2008 SciPy tutorial, plus misc. updates to scripts.
added mathpng and ipy extensions
added sphinx template for doc unit
convert to plt/np namespace, fix Basemap import for version 0.99 (mpl_toolkits)
minor reorg f prex dir
added primes demo
added filter examples
added butter and filtfilt