do you mean an actual tree, with leaves and branches or an ancestor tree? You can view the tree in ancestor mode, by changing your Preferences at the bottom of the tree view. Press the Preferences button and then choose display.
Regarding a printed tree, you can print what you can display. Also Geni has a tree poster printing service, with many other options. I think a circular ancestor tree is one of them I have never tried this service.
1/9/2011 at 6:55 AM
It is a way to make a circular ancestry tree, but not at Geni. I use a circular ancestry tree on paper. About 70 cm x 70 cm. Avraham Rivkind: If you contact me via Geni mail, You will get help to make a circular ancestry tree.