The one thing I miss from Windows is Aero Snaps. I'm not sure where I fall on the maximized window argument, but I see merit in both sides. I've noticed that one of the big things people who switch to OS X have problems with is the maximize window issue. For me, I'd rather have the choice of using the best tool for the job. That tool is Cinch.
http://irradiatedsoftware.com/cinch/
Cinch allows one to use Aero Snaps in OS X, and maximizes the window to the full area of the screen that the Menubar and Dock do not occupy. It is a great app that is nagware for free or 7 bucks to buy. Very worth it IMHO.
Being a WebKit nightly user, I am very excited for Safari 5!![]()
You can get that functionality in BetterTouchTool for free, I personally don't like it though.
You can also download Right Zoom if you want the full screen functionality without the window snapping.