If people are looking for something to do sketches and such - Rita is the best option I've found.

There's a few around, but most are *worse* than Microsoft Paint (Horrible to use, very rigid and hard to draw with).
Rita has decent drawing tools (It's actually possible to draw curved lines, unlike most other application I tried, where they would look like a series of 50px straight lines)

http://www.frykholm.se/rita.html is it's website - it's effectively free (It's not a 30-day trial or functionally-crippled), and you can pay $20 to register it

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I do it this way in Keynote '08. Use "Draw a Shape" and click two points to form a line. Then click on the red circle of one point and drag to stretch to form an arc. Seems easy enough.

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Easy enough to make a curve, but much harder to get a perfectly circular arc, hence the other workarounds.

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