I also saw this post on Safari:
Browser compatibility. The current version of the beta works best in Firefox and Internet Explorer. We are working to resolve issues with other browsers, specifically Safari.I suspect they simply mean they'll make Safari users as miserable as they have with Blogger 1.0, versus having it not work at all. Still, one can hope. There's a discussion group.
Things get confusing if you have a blogger account and accept the invitation to create a second beta account. I would advise against that, though I was eventually able to get the accounts sorted out.
Update: I get it. The new account is tied to my gmail account (Google's identity management solution), but my main Blogger account predates Gmail and has a different identifier. Since I've created a Gmail linked beta blog, I connect to the beta blog unless I disconnect from my Google accounts. Hmmm. This could be messy.