Lots of chatter here and yon about Susan Orlean using Google Docs to write her new book. I love Google Docs, although I rarely use it for fiction writing–Scrivener suits that purpose much better. But I love it to keep notes about various things and to access files so I don't have to open the Evil Evil Microsoft Word, which always makes my computer creeeeep along.
What Laini said, and congratulations on hitting the big 5-0-0th post. I appear to be on 1555 here. Yowza.