Now a plug-in for IE7 users that allows to open the last closed tab. Firefox users must be used to it as when you close a tab in Firefox, it can be opened immediately. But in case of IE 7 till today it was not possible for me to open the last closed tab in IE, until I came across a plug-in that allows users to open not only the last tab in IE 7, but also up to last 200 tabs closed, Amazing isn't it?
IE7 Open Last Closed Tab is a plug-in that makes "Alt-X" reopens the last closed tab. Instead of trying to find it in your browser history, you can hit "Alt-X" and it automatically reopens last tab closed. It also provides Quick Tab Style View, shown when a user hit "Alt-Q", which gives you thumbnails of the previous tabs you've closed. You can then click on the thumbnail of the page you want to open in a new tab.
One more reason for IE users to Rejoice 
Download It Here