[*]Accesssibility for blind/partially-sighted users, or those with JavaScript turned off/unavailable, will suck. [*]Search engines won't cope well with the AJAX/iframe included content if it's done on the browser side. [*]Pages could appear somewhat "oddly", as the content gets loaded and then the comments underneath.
[*]I most use the "quick reply" function - not having something similar on downloads/brainstorm/news would really hurt usability IMHO [*]Without account synchronisation/linking for a lot of people (let alone SSO), I worry about the usability of trying to transparently present two systems as one. Username differences and how flexible are the ITT/talk profile URLs in a maemo.org account? Lots of possiblity for user error. [*]How do we ensure that the context of the brainstorm/download/news page is presented when users just view through tmo? The Wordpress article copied the text - which seemed to work quite well for text-heavy stuff like blog posts; but what about downloads?