Julian Sanchez and Dave Weigel have a long, terrifyingly thorough piece up on Reason's website cementing the allegations that Rockwell wrote the Ron Paul newsletters into a rock-solid case.
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Back when the book Primary Colors came out, the (originally) anonymous author was identified by statistical analysis of the writing style. Since apparently copies of the newsletters exist, and other writings by Lew Rockwell exist, can't someone do a comparison?
On one hand, I'd like for Lew Rockwell, or whomever wrote the newsletters, to come forward and accept responsibility so we can get this behind us. But on the other, I don't see this as a big issue beyond the libertarian-leaning blogosphere. Especially since Paul's supporters are overwhelmingly political newbies who have never been impressed with what pundits have to say.
If this campaign had a reasonable shot of clinching the nomination then this would be a far more important issue, but at this point Republican primary voters have pretty much made up their minds, and they are more than satisfied to support the GOP status quo regardless of Paul's old newsletters.