This requires a companion app like Quicksilver so you can use hotkeys to launch the script. If you don't want to run Quicksilver, etc. all the time you can use a javascript bookmark to resize Safari windows. Just make a new bookmark called "size" or whatever then put this in the URL field: " javascript:self.moveTo(190,35);self.resizeTo(930,915); " (without the quotes). Just change the numbers across and down to fit what you need. You can make different javascript bookmarks for different sizes and screen positions. I keep the resize bookmarks in my Bookmarks Bar in Safari and click them whenever I want my Safari window to be the size and position I want. If for some reason, the windows don't open where you want them to when you open new windows you can do the resize, then adjust the window in size slightly then back again then all Safari windows will open to that size from then on until you change it or a website specifies a change in size.