This is a great do it yourself (DIY) project that's quick, easy, and inexpensive. I got the basic idea from a Lowes magazine that came in the mail. The online version can be found at http://lowescreativeideas.com/Home101/Stack_It_Up_Table_0911.aspx.
Cut the boards.
Sand the edges so they're not so pointy.
Paint the boards.
Cut the dowell into 20, 2-inch pieces.
Mark where the first two layers touch and drill the necessary holes.
Start from the bottom layer and work your way up.
I originally planned to have just 4 boards as the table top, but that looked too small, so I added 2 more.