I dont know if timeline has ended but... URL helper has an "extension" parameter, as we can see here:
http://www.google.com/codesearch/p?hl=en#uyCl3L51_dI/gluon/html.py&q=URL package:http://web2py\.googlecode\.com&sa=N&cd=1&ct=rc&l=119 But not here: http://web2py.com/book/default/chapter/04?search=URL(#URL 2010/8/9 Massimo Di Pierro <mdipie...@cs.depaul.edu> > Tomorrow is likely the last day to submit comments and corrections about > the online book. Then it will be frozen to go to print. > > Massimo > -- http://rochacbruno.com.br