Yes, Safari 3 Beta has been made avaliable for download, and we (the poor Windows users) now get to play with it, because Apple launched a Mac and a Windows version.
It appears to be using the same rendering engine as the Mac version, so in theory we shouldn’t have to talk about how things look in “Safari Mac” and “Safari Windows”. With a little luck, just “Safari” will do. 
There isn’t much more to say, other than download beta 3.