Updated SCOTUSblog StatPack:
The latest ScotusBlog StatPack of the current Supreme Court Term is now available. Some interesting stats from it:

  The percentage of cases in which Chief Justice Roberts has agreed in full with each of the other Justices so far this Term (in order from most agreement to the least) is: 1) Kennedy, 87%; 2) Alito, 81%; 3) Breyer, 73%; 4) Souter, 66%; 5) Ginsburg, 64%; (6)-(7) tie between Stevens and Scalia, 62%; and 8) Thomas, 60%.

  On the other hand, the percentage of cases in which Chief Justice Roberts has agreed as to the result (affirm, reverse, etc.) with other Justices is: 1) Kennedy, 91%; 2) Scalia, 89%; 3) Alito, 87%; 4) Breyer, 84%; (5)-(6) tie between Stevens and Thomas, 79%; (7)-(8) tie between Souter and Ginsburg, 72%.

  The two Justices with the highest rate of agreement in full so far this Term are Roberts and Kennedy, at 87%; The two Justices with the highest rate of disagreement so far this Term are Thomas and Ginsburg, at 40%.

  The Court has reversed in 59% of cases so far this term; that includes 5 of the the 6 cases decided so far from the Ninth Circuit