Dear Erik, Marshall and all,
Asking questions here is appropriate, I think. However, there is also a SIPTA Q&A site: <http://sipta.org/qa/>. But I do not know whether it is still maintained. The maintainers read this list, so they'll respond. As I seem to have lost my account details there, I'll give a quick answer to your question here. If needed we can continue on the Q&A site later.
math.stackexchange.com stats.stackexchange.com mathoverflow.net
I think all three can be appropriate, depending on the type of question. Perhaps the community could decide to use the Stack Exchange sites if maintaining and using its own Q&A site is too burdensome. But then we'd need to create a tag in those and have IP people follow that, or have an automated mail be sent here whenever a new question with the ‘imprecise probability’ tag appears there. Let's wait to see what the SIPTA Q&A maintainers think.
The Q&A and technical wiki (http://www.sipta.org/wikIP/pmwiki.php) were both initially set up to offer the community some collaborative online tools to collect information about IP.
They are still up and running, and can easily be maintained, but are not currently promoted, for the reason that initial participation was quite low. Maybe it would be worthwhile to reactivate them for more IP specific questions, run them in parallel with stackexchange general, or more simply only use stackexchange platforms. In the meanwhile, you can also post your question on the Q&A website (I do not remember if we linked it to the mailing list in any way, but it may be a good idea to look if any question in the Q&A could be automatically redirected to this list).
Cheers
Sebastien