One notion on the default templates. Currently OpenACS does not support skinning (it might after changes from CTK are rolled in). What I could think off though is to provide an template install script that takes the templates out of the /templates directory and extracts the files to all the places they need to be. Obviously the template install package should include a preview of the templates.
As for the W3C accessibility compliance, you face the problem that some HTML code is still contained in .TCL files and even some .adp pages make it harder for people to access them. The toolkit is being rewritten to take this code out, once a developer starts working on a package (at least I hope so). But I guess Don and Dave are more apt to give you an detailed comment on how much work would be needed on the toolkit in both regards.
