don't believe everything you think

Interesting. A few quibbles, though:

First, is it clear that Leia only adds her holographic message to R2? Is it explicit that R2 is already carrying the plans at this point? I'm not sure it is. While I'm willing to accept the "R2 as spy" paradigm, I think a large part of the argument rests on the assertion that R2 has the plans in him, unbeknownst to Leia.

Also, why would it be necessary for Obi-Wan to accompany R2 on the mission to Yavin?
Isn't stopping to pick him up a needless complication in an otherwise simple plan? I mean, I can see if Organa wants Obi-Wan to be at Yavin when the shit goes down, cos I agree that those two plus Yoda equals the embryonic Rebellion. But it seems really risky to put three of the Rebellion's most valuable assets (R2, with the plans; Obi-Wan, and Leia) on the same ship when a seperate, less obtrusive, less risky mission to pick up Obi-Wan could be undertaken. I think the ship with R2 coulda/shoulda gone right to Yavin.

Also, in retrospect, using a counselor's ship as cover to dissuade Imperial attention seems to have been a bad idea, since it did exactly the opposite.

Last, while I sympathize with DataWhat's skepticism regarding R2 making deals with Jawas, I think the alternative, that the Jawas just happened to be on their way to a stop at the isolated and desolate moisture farm (or, luck, more simply put), strains credulity even farther.