И они говорят, что это просто сервис-пак...

Patrick Smacchia в своем блоге взял и подсчитал с помощью NDepend изменения в .Net FW3.5 SP1:

Summary:

# Assemblies 112
# Namespaces 919 to 935 (+16 +1.7%)
# Types 39 988 to 40 513 (+525 +1.3%)
# Methods 387 421 to 386 790 (-631 -0.2%)
# Fields 241 567 to 246 795 (+5 228 +2.2%)
# IL instructions 8 598 933 to 8 620 940 (+22 007 +0.3%)

1.393 new public methods
79 new public types
No public types removed (hopefully!)
14 non-public methods became public
6.384 methods where code was changed
2.485 types where code was changed