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Quoted: Super slow motion videos of Roger Federer - hitting mostly forehands and a couple of backhands. Incredible detail of racquet vibrations, him watching the ball ...

Quoted: Video clip of a classic eastern topspin forehand, with instructional comments on key points of grip, stance, power production, and swing path.

Quoted: To counteract the resulting natural downward tilt of the racquet face, you must meet the ball slightly farther forward (at a given height) than you would with an Eastern grip, and while it's possible to hit flat, you will generally need to swing upward more sharply, which encourages you to hit topspin. The average grip among the pros now is Semi-Western, primarily because of the importance of topspin in the modern, advanced game.

Some good tips here.

Quoted: How to fix problems with your forehand in tennis: adjusting your forehand grip, swing, stance, and timing to hit better forehands.