Image upload and autosave appear to be broken. :-P
Update: If you're following along at home, Safari 3 does not implicitly create a
<head>element when you programmatically (e.g. with
document.write(...)) set the contents of an IFrame. This causes an initialization error in the Blogger post editor because there's no place to stash the
<style>tag for spellchecking, which throws off the autosave initialization.
Without autosave, image upload to draft posts doesn't work, since Blogger autosaves before showing the upload dialog.
Another update: Damn Safari 3 is speedy-quick. It is now a contender for browser-of-choice.