I'm using 37signals' Basecamp webapp for collaborating with many people on data standards. Generally I like the product. There are a few issues like not being able to easily follow a topic or wiki (writeboard) for changes. Their wiki-mechanism kind of sucks (finicky, no nested lists, tables, etc).
The biggest issue I have is that I can't seem to make everything public. Though you should need a login to contribute or collaborate, I want the outside world to see what we're working on as easily as possible. I want all of our great content to be search engine indexable. I'd like to not have a separate front end site for the world to see and a different site for us members to collaborate with.
Any webapps like Basecamp that I should be looking at instead?