iWork from Apple is nearly a complete package now that there is a spreadsheet application called Numbers. However, as great as the templates that come with the suite are you can always do with more. Here are some places that have additional templates:
iworkcommunity (lots of free ones)
KeynotePro (they sell their templates so I have no idea how good they actually are)
Jumsoft has some very orange ones for sale.
Oneeyedgoldfish has some for sale and a free one.
Those are about the best I could find. I'm sure there are more floating around though.
