redirect mobile devices

I tend to agree with Michael about it being a chore and a half to maintain these lists. That being said, here's the logic you were asking for, which is a reverse of what you already have:

when HTTP_REQUEST {
     switch -glob [string tolower [HTTP::header User-Agent]] {
           "*blackberry*" -
           "*ipad*" {  }
           default {
                           HTTP::redirect "http://mysite.com/[HTTP::uri]"
          }
    }
}

Basically all you need to do is make the cascading list of fall-through logic end with something other than the redirect. It could be sending the request to a pool or simply doing nothing, as above. Then everything that doesn't match one of those cases, which are the mobile cases, will fall through to the redirect and get sent to your non mobile site.

Colin