An update to the USCF site now allows players to look up certain game statistics on any player. Using
Larry Christiansen as an example, you can see how he scores against players with a certain rating.
Or, you can see who his all-time (since 1991) most common opponents are and how he has scored against them.
You can also look up a player's record by year.
Of course, it's most fun to look up your own stats.