Way back in the dark ages of XP to get IE to open to nearly full screen every time instead of the smaller dfault size I used the Drag the sides method rather the the maximise button. This worked OK in XP but not in Win 7 running IE 8. Very frustrating!
The answer is to set your size by dragging then hold down the Alt key and press the "X" close button. Next time you open that link it will open the the size it was when you closed it!
If you want it to happen in all windows of IE 8 then in IE 8 click Tools, Internet Options, Go down to Tabs click Settings and check the button "Always open Pop up in a new window" and below that "A new tab in the current window"
Hope some may find that useful!