The annoying licensing person here again.  Sorry.

PPL may, or may not, be compatible with the Squeak License.  My first 
review of that license indicates that the question may be, well, 
complicated.  I am heartened by the specific provisions 
distinguishing Covered Code, from modifications to Covered Code, to 
Larger Works.  In particular:

3.7. Larger Works.
You may create a Larger Work by combining Covered Code with other 
code not governed by the terms of this License and distribute the 
Larger Work as a single product. In such a case, You must make sure 
the requirements of this License are fulfilled for the Covered Code.

I consider this to be quite promising, as compared to the problems we 
had with GPL.  However, if there is going to be a large development 
effort to this end, the question should be fathomed early on.
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