Apart from the obvious (like checking your email, the company intranet, facebook, linkedin and whatnot) here is where I usually browse to over the morning coffee or at least at some point during the day:

Popurls.com - great for a general overview of whats buzzing around the web
Videosift.com - If it´s video that matters and not on videosift, it doesn´t exist
Gizmodo.com - Love to take a good look at all the up and coming gadgets that I can probably never afford (they have a german site, too, but I prefer the US site since it´s usually faster)
Dwigger.com - What´s on peoples minds? Let´s find out...
Spiegel.de - German news site. Usually pretty quick and accurate. (click here for english version)
Google Reader - To catch up on the blogfeeds I subscribed to
Sydney Morning Herald - to find out whats happening on the other side of the globe
Lifehacker - Might as well hack your own life before someone else does
YouTube - To check on any new comments for my clips

Not necessarily in this order, but close.

What sites can´t you live without during your average webday?