Thanks so much for taking the time to give us some constructive feedback. I really appreciate it.
I took a few minutes to implement just two of your many good suggestions. I changed "Contribution Instructions" to "How to Contribute", and I added a note that openacs.org is running OpenACS.
Some of the others, such as exposing email addresses, and previwing when posting to forums, have been addressed in the upcoming 5.0 release.
Thanks again. It's very valuable for us to know what we look like to someone just checking our software out for the first time.