If you don't like YouTube or "can't get on it in work" then you might need BlinkX TV. Did a search on "Thomas Tank" and found a few episodes on there - try this one. Obviously, we're talking about a video website.
Also searched for "Sigur Ros" and found these videos. Let's try searching for Isis. Woah, just discovered there's "Switch to Movie" mode. This plays the video in the entire screen. Here's the results for Isis anyway. It found a lot of videos; one of them is The Beginning and the End.
It seems that Blinx TV searches all the other video sharing sites for the results. Very clever. Here is a thumbnail link that it offers you...
Click to see Video
Have a go yourslef (sic)..... www.blinkx.tv
Via Norman Roberts Blogspot