IM Emory Tate has annotated the opening of the game in which he beat FM Michael Lee of the Seattle Sluggers last week. I guess 3. ... f5 is something of a novelty in this position, though I gather it has been played before in master competition. In any case, it worked for Emory.
Go here to see the game, and feel free to add your own comments, kibitzing, and additional annotation.
Position after 3. ... f5!?