WordPress had this waiting for me when I signed in:
We will be making some code changes shortly which will log you out of your WordPress.com account. They should only take a few seconds and you should be able to log in afterwards without any problems. Please save your draft or update the post/page often to prevent content loss.
I’m guessing these are the bug fixes that will appear in 3.0.1.
My Web host is busily upgrading the Debian Linux machines on which my sites run to the Lenny release.
Of course, I had to find out: why “Lenny”? Turns out that Debian releases are named for characters from Toy Story. (The next stable release is dubbed “Squeeze.”)
Whether this will affect uptime, I do not know, but I suspect the impact will be small unless I’ve still got some stuff floating around that runs on PHP 4, which dates back to the Ice Age.