This is Rob's second post to Make's Blog on this subject. The first was a before post where Rob's was very passionate on the beneficial efforts of a company being open.
Link to the first post.
The second post theme is why will Bre Pettis not say yes are no to the open close question?
Link to the second post.
On a side note. It looks like Josef Prusa has hacked Makerbot's new closed control software Makerware for the Replicator 2 to be used with the Thing-O-Matic.