Tabs in IE7 are a great (and long overdue!) feature. Below are some keyboard shortcuts for using tabs that some people may find handy - the CTRL-TAB is one I definitely find indispensable.
Open links in a new tab in the background CTRL+click Open links in a new tab in the foreground CTRL+SHIFT+click Open a new tab in the foreground CTRL+T Open a new tab from the Address bar ALT+ENTER Open a new tab from the search box ALT+ENTER Open Quick Tabs (thumbnail view) CTRL+Q
Switching between tabs
Switch between tabs CTRL+TAB/CTRL+SHIFT+TAB Switch to a specific tab number CTRL+n (n can be 1-8) Switch to the last tab CTRL+9
Close current tab CTRL+W, or CTRL+F4Close all tabs ALT+F4 Close other tabs CTRL+ALT+F4