I am proud to present my new REK coffee table: http://www.reinierdejong.com/2012/01/rek-table/
REK is a coffee table that grows with your coffee needs. When you have visitors, just get some chairs and extend the table any way you like. Enough space for all those coffee cups and store your book or knitting set in the spaces underneath the tops.
You can extend REK in various ways. Built-in stops make sure you will not pull out the sliding parts too far. Of course you can also put REK in a permanent position that fits best to your interior.