The IPB error is due to our single sign-on script doing things IPB doesn't like to do during sign-in. I guess we could use a location() header to reload the page after account creation, but meh.
Gallery problems are due to a new design.
FAQ will be fixed when I get home. Cheers for noticing.
Link colours will be changed soon enough.
The frequent AJAX calls aren't load heavy, as varnish redirects them to an event-driven JavaScript node.js server, which processes the requests in ~1ms.
We won't use IRC, because IRC is an outdated technology.