The Factor web site is now running the latest code. In particular, this means you can browse the latest Factor documentation online. This includes documentation for the UI, which is something I've been working on for the last couple of weeks. The documentation is always a work in progress, but I think the fundamentals of the UI are now well-documented and people should have a much easier time writing their own gadgets.
The previous HTTPD instance running on Factor 0.85 never crashed, and ran continuously for a month and a half. I hope 0.87 keeps it up, but who knows, the web site might be down by the time you read this!