I made a modified version of the crunchyroll subtitle decryptor on page 2. My version automatically determines the subtitle id (english subs only) and pulls it. Save file is automatically determined from the episode title (series + episode #) but if the file exists gives an opportunity to rename. It will not overwrite pre-existing files.
Use it like this:
python decode.py url
Where url is the actual streaming url. This works to grab subtitles for episodes that are member only as well without having to login (the page still gives the subtitle id).
http://dl.dropbox.com/u/1078975/crunchy_xml_decoder.zip