I do have a lot of evidence for the lunar Sabbath. Unfortunately, the evidence is not overwhelming. I do belive that the weight of evidence does support this view. Adding in the historical evidence, it is quite convincing.
The first line of evidence comes from the meaning of the word "mowed" (strong's 04150). This word's use in Gen. 1:4, Lev. 23, and Psalms 104: 19 make it clear that the moon should play an important role it determining when Sabbath is. There also seem to be a lot of similarities between the Sabbath and the new moon.
The second line of evidence comes from the record of when and how Isreal kept Sabbath and the festival of the new moon. Beginning in Exodus 12, whenever it can be determined the date on which Sabbath was kept, it was kept on the 8th or 15th (full moon), and by extension the 22nd, and the 29th, followed by a one or two day new moon festival in which they would not work, buy or sell, and on which the temple would be open, in much the same way that Sabbath was celebrated. These new moon festivals were not counted in the Sabbath counting, but the counting would instead begin again after the appearance of the new moon.
The third line of evidence can be made in absence (not as strong evidence). In the old testament, there is no record of one day of the week being distinquished from another. (Search for "day of the week" and "day of the month") In the Jewish mind, there seems to be no conception of the week as we know it. If Sabbath occured on the same days of each month, there would be no reason for a "week" as we know it. There also seems to be no urgency in recording successive Sabbath dates (and no record of it). This would seem to be important if the correct reckoning of the Sabbath depended on this record. Otherwise it might be possible for someone to have forgotten which was the correct day.
Finally, evidence for the existence of an ancient continuous week is extant. Instead, most ancient civilized societies divided the lunar month into "weeks" of various lengths (7-10 days). The week as we know it seems to have come into existence in the late second century of the common era, and was independantly adopted by the christian and the jewish world by their rulers.