I finally found Speed's hot dog, and yesterday, on my virgin outing, I was the proud beneficiary of the last hot dog of the day (around 2:30). This place is nothing short of amazing, and Speed himself couldn't be any nicer. $5 for a hot dog sounds a bit extravagent, but you gotta know that these are hot dogs on steroids, not your normal ballpark variety. Besides charring them on a grill, he finishes the dogs off with a brush of his special BBQ sauce, and when you ask for the "works", he'll put in some onions, peppers, mustard, and more sauce. Speeds is located in Newmarket Square, which is an industrial/warehouse zone, just off Mass Ave below the Boston Medical Center.
I've seen a few posts on these boards with a reference to Speeds, but buried in the threads, and thought it was deserving of it's own post. Please go and enjoy.