I am working on a similar boggle clone for facebook (there is none for my main language).

What did you use for the server side? First I started with a Java server with sockets but I noticed that it does not work behind the firewalls and now I am using PHP as a messenger between the java server and flash client. Since flash is now only doing HTTP requests it should be fine with firewalls.

Also did you pregenerate the boards? I generated some but they are not very good.