There are people blaming Google and others saying Samsung. Looks like it could be Samsung. Hell, it could even be Verizon, but I don't know what anyone would gain by blocking Apps2SD?
Over here a judge has denied Apple's claim that Samsung's Tab has infringed the iPad design and ordered Apple to apologise to Samsung on their website.
I belive the Tab is soon to be banned from sale over there due to the same claim.