I have just finished a project where my Wife and I built a dining room table. All for about $120 in supplies, and another $100 in tools that I did not already have.
Inspiration for the project came from an article on this site:
I modified the design a little bit to better suit our needs. I utilized Sketchup for the CAD design of the top. The results were pretty amazing. I still need to do chairs and a bench. But the bulk of the work is done.
And finally, some action shots
Another CAD output