Two forums are a possibility. Why not, it's just another row in the database! I like the idea of having a forum for designers that won't be cluttered with tech talk about OpenACS innards.
As far as graphics designers contributing to UI discussions ... usability issues for the toolkit at large really belong in our 4.x design forum. I welcome input from everyone on usability (the fact that there are issues in this area is no secret) but such discussion needs to be in a place where people, both techie and others, will expect it and a "templating for designers" forum won't be where those who will actually implement usability improvements will expect it.
