I’ve been using the Safari4 beta since it first came out and it is brilliant. Mainly because it is just so damn fast.But if you use WordPress you may have come across a very annoying bug. If you use the WordPress Visual Editor, whenever you try to create a link (or do anything that invokes the TinyMCE pop up window), the whole screen greys out. All you can do is press the back button. Losing any changes you had made on your page or post in the process.
Unfortunately the problem is within the TinyMCE editor used by WordPress. The problem has been fixed and will be available with the WordPress 2.8 release.
Until then, if you use the Visual Editor with WordPress you are probably best off using Firefox until WordPress 2.8 comes out. It can be hard to remember *not* to click any of the TinyMCE buttons.