I really like the Polish opening (1. b4) which is similar to this, but I think this one leaves the king more exposed and doesn't develop as well.

1.g4, is played by Awardchess, he beat me with it. If you had any questions about g4 he'd probably have a lot of knowledge to share on it.

Although, knowing Awardchess, what he replies really could be anything :)

RetG - Given that our sample size there is only three, I don't think you can actually say that G5 has any benefit. 

Interesting opening.  I agree with Gonnosuke, the second player must be cautious.  However, the chart shows that black's greatest success comes from 1. g4!? g5!!?

   Quite likely that is because white is taken off stride by the response. 

     I have faced 1. g4 once, and won (as black) fairly handily after 1. .... g5!!?     From the look on my opponent's face (sheer consternation), I believe that my response was quite unnerving to him and psychologically, he had lost immediately.

its all right if u follow with Bh3

Numerous traps require careful, cautious play from the second player.  In my opinion, it's a worthy addition to the arsenal of anyone who enjoys playing offbeat openings.  Limited value in correspondence chess; much more valuable (i.e. viable!) in OTB and blitz games.

-Gonnosuke