Here is a list of hotkey whe working with tabs in IE8:
The following table describes the keyboard shortcuts that are available when working with tabs.
Open links in a new tab in the background
CTRL while clicking the link.
Open links in a new tab in the foreground
CTRL+SHIFT while clicking the link.
Open a new tab in the foreground
CTRL+T or double-click an empty space on the tab row.
Open a copy the current tab in a new tab in Internet Explorer 8
Switch between tabs
CTRL+TAB to move forward or CTRL+SHIFT+TAB to move backward and CTRL+1-2-3-4-5 to switch from one to another
Close the current tab (or the current window when there are no open tabs)
CTRL+W or ALT+F4
Open a new tab in the foreground from the Address bar
Switch to a specific tab number
CTRL+n (where n is a number between 1 and 8)
Switch to the last tab
Close all tabs except for the one you're viewing
Open Quick Tabs (thumbnail view)