Here are some lessons that I learned from the whole Dave Winer weblogs.com affair.
- Own you own domain name. If your blog is at your own domain name, then if you are using a hosted service and somebody takes it down, you can move your content without breaking links.
- Keep backups of everything that is hosted by everybody else
In the long run, it will be so easy to host your stuff, that you will rather than having to worry about other people taking down your stuff. Decentralists rule long term!