I guess if you put mail out across the CL mailing list to say that members of that list may receive promotional messages for projects where you (CL) have acted in a consultancy or partner role, with the option to opt out / unsubscribe then that would be fine.
Noone doubts your intentions Mike, but it goes to show how easy it is to slip into these things.
Strictly it's a data protection issue - two of the principles under British law are that data should only be used for the the purpose for which consent was given, and retained only for as long as necessary for that purpose. (I imagine US law must be similar).
The specific problem here was that ascent was only given (explicitly and implicitly) to use emails for CL specific communication, and they were in fact used for another purpose. Arguably the CL mailing list should no longer even exist under the 2nd principle I stated (but I think everyone has the hope that CL may see the light again some day - so retaining the original list would therefore be appropriate for whatever may be considered a reasonable period).
Anywho - this is drawing this thread off topic and it wouldn't be fair for this to negatively impact the project itself.