Davenport's forehand is only good when she's standing still. Same with Rubin and Dokic.
Best forehands in the game are Serena, Henin, Clisters, Cappy, Schnyder, Shaughnessy, Dementieva. Loit has a pretty good one as well for a lower-ranked player.
Worst forehand of the top players - Venus by a mile.