MORE BLOG COMMENTARY on that supposed first-century manuscript of Mark:
Larry Hurtado: Newly-Identified Early New Testament Fragments? Larry notes that the fragment seems to be part of the Green Collection (and therefore connected to that supposed second-century manuscript of Romans).
John Byron: Earliest Copy of Mark Found? John is cautiously optimistic.
Follow the links in both posts for more Biblioblogospheric reactions. PaleoJudaica background is here.