1 - if you watch the "Wave and GWT" video from Google I/O, you'll see that both client and server are written in Java. (They share some of the truly hairy commu

1 - if you watch the "Wave and GWT" video from Google I/O, you'll see that both client and server are written in Java. (They share some of the truly hairy communications code.) Of course, the client compiles down to Javascript (using GWT). 2 - I don't think they've addressed the spam issue yet.