I'll throw together a python script to get the job done, and will post the result here.
LessWrong is written in Python, so instead of writing a scraper script (which I suppose you were going to do), you can become a volunteer, grab the code at GitHub, write a proper script that can access the database directly, and commit it into the LW codebase.
I've been wanting a printable copy of the sequences to read through in meatspace. I wrote a quick scraper and uploaded the results here http://pwnee.com/Sequences/list.html
Inter-linking doesn't work, but I just wanted a printable version anyway.