Since we've deprecated the wap.wikipedia.org hostnames (for one thing it's not accurate, we don't actually support WAP as an access protocol!) in favor of *.mobile.wikipedia.org, it might be nice to issue HTTP redirects so people see the new name.
Downside: higher latency for people actually using the old URLs.
Upside: better visibility for new URLs and better cachingness.
Should be a simple matter of tweaking Apache configuration so a separate vhost handles the one and does redirects to the other.