OT: non-commercial open source license?

[Aaron Vegh]

Hi there,
I've been following progress on a tool for David Allen's Getting
Things Done methodology (if you haven't heard of it, check it out here
-- http://www.amazon.ca/exec/obidos/ASIN/0142000280/qid=1136388933/sr=8-1/ref=sr_8_xs_ap_i1_xgl/701-9147722-8397935
and browse the web for "GTD")

The tool is called Tasktoy (www.tasktoy.com), and the developer is
hosting this rather interesting specialized content management tool on
his own server. I've asked about him open-sourcing the tool, but his
concern is that someone would post their own version and charge for
it. So the question became: is there an open source licence that would
restrict use to personal only, and not commercial?

I have found it very difficult to penetrate the nether regions of the
open source licensing world, so any help the experts here could
provide would be appreciated!

Cheers,
Aaron.
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