I don't know about "classic tests", but I've successfully written fully-functional scripts while having a phone conversation, browsing HN and chatting on IM. You just have to set priorities. You obviously can't read something in as much depth, but it's great for reading for filtering out good stuff to read in more depth later.
The original article excerpted in the lifehacker post: <a href="http://news.bbc.co.uk/2/hi/technology/8219212.stm" rel="nofollow">http://news.bbc.co.uk/2/hi/technology/8219212.stm</a>