Hi Lorelle: I emailed a tested archive of the Sandbox and just be safe re-zipped the version of my blog with a different client. If anyone else has any problems, please just let me know.
I hate "swallick." Sounds vulgar. Grrr.
Anyhow, yes, Wank is right on. The Minimalist Sandbox is gone (unless you look very, very closely—but why would you?) and has been replaced by the Sandbox.
I believe the readme.html will be integrated in the "Sandbox Skins" menu for blogs on WordPress.com, time provided. Please be patient on that one.