For those of you out there using the Internet Explorer 8 web browser, customizing the Command Bar makes it a lot easier to get to specific functions in IE 8 faster.
This is what mine looks like:
From left to right:
Home, InPrivate Browsing, Internet Options, Page, Safety, Tools, Manage Add-Ons, Zoom
In particular, I really like having the InPrivate, Internet Options, Manage Add-Ons and Zoom there because it saves me from having to hunt for them (as some are quite buried).
To modify, right-click an empty area of the Command Bar, then click Customize, Add or Remove Commands…, like this:
You’ll see this window:
Add, move or remove your selectable buttons in the Command Bar from here.
Also remember that to see all the icons you add in there, uncheck the option for Lock the Toolbars (see screen shot above) so you can drag the bar out to see everything, then re-lock afterwards if you like.

But Zoom and InPorn Browsing buttons are already at the bottom right corner of IE8. Using so many buttons just leaves less room for tabs. I have only Home, RSS, Page and Tools.
Other useful buttons can be easily got from the Page and Tools button menus, like Reopen Last Browsing Session, Manage Addons, Developer Tools, View Source, etc..
I also use Show Only Icons, as it saves space and makes it look nicer.