Someone posted a really great table for their kitchen a while ago. Can't find it, but they used a sofa table/console which had leaves that flipped over the top or down. It was a beautiful table. Maybe try an image search on google for sofa table with drop down leaf.

I think there was a table like emagineer is describing in the pottery barn catalog.

I have seen some really small, space saving tables at Amish furniture stores.

Round tables also tend to very smaller and more compact.

i saw 2 i liked at Target this week.

Last fall someone put a picture/site of a beautiful wood table that was very small when the leaves were down (or pushed in)- I thought I saved it, but can't find it. I don't know if it would suit you. I would like to find it again myself but am having no luck- I think it might have been posted around September.

ilmbg...That is the table I mentioned. It was beautiful. And I did find the original post. The table was from Art and Artifact. The link shows it is no longer available. Also, a google image search didn't come up with anything like it. What was interesting though is I also did a search on "pull out tables" and found bunches of interesting cabinets with tables that pull out. Not what the poster was looking for, but in a really small kitchen the idea would be great for extra workspace.