In addition to their excellent endgame db, Shredder also has an online opening db where you can put in any opening moves and get statistics from human Grandmaster games for those moves and openings.
For example, in my favorite Torre Attack after the moves: 1.d4 d5 2.Nf3 Nf6 3.Bg5 the two most popular moves for Black are 3…Ne4 against which White scores 53.4% (+62 -50 =63) and 3…e6 which scores 53.3% (+27 -22 =26) for White. The least successful move has been 3…c5 which was played in 19 games and White scored 71% (+9 -1 =9) while 3…g6 has yielded the best results for Black as White only scored 35% (+2 -5 =3). This is worth checking out to see how well your openings score in GM games.
Ready for a surprise? I have been known to play the Grob Attack (1.g4) on occasion. It shows up as being played 25 times in GM games…and the results? +11 -8 =6. Who would have have thought that!