I was just wanting to know how, too! I've searched the blogs and info pages, but can't find how to host a private game and how to invite. Hope we find out! Guess i'll Google it.

I also wanted to know!
Why are there no answers to these kinds of questions in the FAQ???

When you are in the Game Page, there is a 'Private Game' box to the right of the 'German rule/Game Host' box.

http://www.wizardcards.com/viewthread.php?tid=3317

I'm also stumped! Been digging through articles, but no luck finding the secret to hosting a private game or sending invites. It's like a real-life puzzle game. Maybe there's a hidden level where the solution lies. I'll keep searching...