g6 and they will prob carry on with book moves to KID
1.d4 Nf6 2.f3?! OTB

g6 transposing into a KID would be OK. I don't see a lot of KID OTB really,
2...d5 3.e4 dxe4 4.Nc3 makes it even and open I suppose.

Keep in mind this is around Class C level so I don't expect too much preperation. Yes if they do go the KID route it'll be the Saemisch which is fine. I'm just a little tired of the Slav right now

d5 is the first thing that comes to my mind...or h5, if you intended g4 next.
Come to think of it, after d5 3. e4 we get the infamous Blackmar-Diemer Gambit!

That g4 could be fun actually. 1.d4 Nf6 2.f3 d5 3.g4 though then after they push the e-pawn it must be necessary to pin that knight. Hmm, I doubt people will expect that.

3.e4 dxe4 4.Nc3 exf3 5.Nf3 Bg4 6.h3 Bh5 7.g4 Bg6 8.Bg2 actually scores good for white in the game's it's been played in.

I know of a player who regularly plays that sort of thing...he usually follows it up with 3. Be3 and 4. Bf2, but also Nc3 and g4 sometimes. The BDG is a better approach to it though...

Peter Leisebein vs. Bernhard Fels (Correspondence 2004)
1.d4 Nf6 2.f3 d5 3. e4 dxe4 4.Nc3 exf3 5.Nxf3 Bg4 6.h3 Bxf3 7.Qxf3 c6 8.g4!? e6 9.g5 Nd5 10.Bd3 Be7 11.0-0 0-0 12.Ne4 Nb4? 13.Nf6+!! gxf6 14.Bxh7+ Kg7 15.Qh5 fxg5 16.c3 Nd5 17.h4! Nf6 18.Rxf6! Bxf6 19.hxg5 Bxd4+!? 20.cxd4 Qxd4+ 21.Kg2 f6 22.Qh6+ Kf7 23.Bg6+ Ke7 24.Qg7+ Kd6 25.Qxf8+ 1-0 (See "Attacking Manual 2" by J. Aagaard page 211)

According to Jacob Aagaard that game (post #18) is an attacking masterpiece. It looks like a Blackmar-Diemer gambit.

I'm just a little tired of the Slav right now
But Black's playing 1... Nf6
and some other d4 mainlines :P

Hmm, not as rare as I thought:
http://www.chess.com/opening/eco/A45_Indian_Game_Paleface_Attack
Looks like white's odds get a lot better the sooner you convert it to a BDG, though.

2 f3 is just not a good move.
It takes away the Ng1's best square, weakens the dark squares on the Kingside, and makes Black's eventual counterplay with either ...c5 or ...e5 more effective. It also wastes a critical development tempo on a pawn move in violation of the basic opening principle.
I would respond solidly with 2...d5 and if 3 Nc3, there is no need to allow White to comfortably get into a Blackmar-Diemer Gambit with 4 e4 - Black can counter immediately with 3 ...c5.
The players you might fool and confuse with this opening are only those you would easily beat anyway. Against others, you are at least giving away any hope for opening advantage, and perhaps even passing the initiative to Black.
The intent here is not to fool or confuse anyone, it's really just to play a different position out of book than the standard set-ups I'm used. I'm sure with best play by black he'll have a slight advantage, versus beig even in a Colle, and white maintaining a slight edge in the QG. But in a tournament sometimes it gets to be less fun when you play multiple long games in closed and semi-closed positions and this would be one way to blow things up for a game. If I was really ambitious I would look for a pawn sac on moves 7-10 to open lines in the Colle/QG type positions I play.

2 f3 is just not a good move.
It takes away the Ng1's best square, weakens the dark squares on the Kingside, and makes Black's eventual counterplay with either ...c5 or ...e5 more effective. It also wastes a critical development tempo on a pawn move in violation of the basic opening principle.
I would respond solidly with 2...d5 and if 3 Nc3, there is no need to allow White to comfortably get into a Blackmar-Diemer Gambit with 4 e4 - Black can counter immediately with 3 ...c5.
The players you might fool and confuse with this opening are only those you would easily beat anyway. Against others, you are at least giving away any hope for opening advantage, and perhaps even passing the initiative to Black.
Not sure if I agree. To me it just seems like a clever move order in which a Blackmar Diemer is likely to be reached. I used to play d5 against 1. d4 and just go into a Caro-Kann mainline with 2... c6 if my opponent played 2. e4. When I started playing 1... Nf6 instead I just couldn't find a way to refute the rare move 2. f3. Obviously 2... d5 is the most natural reply to fight for the e4-square. However the problem here is not 3. Nc6 but the immediate 3. e4 dxe4 and only now 4. Nc3. This is a transposition into the Blackmar diemer gambit ( 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3).
1.d4 Nf6 2.f3?! I'm thinking of trying this OTB some just to confuse people out of book. What do you guys think will be the likely responses?