download and install scotch from http://darcs.idyll.org/~t/projects/scotch/doc/

run-recording-proxy

** scotch proxy server running on 127.0.0.1 port 8000 ...
** RECORDING to filename 'recording.pickle'


Set your web browser to use a proxy server at the address you specified to the recording proxy (here 8000 by default)

Perform actions you want to record

stop the recording proxy

translate-recording-to-twill recording.pickle > whatever.twill