I was at the post office today picking up the Barbara Jordan stamp and, to my surprise, the Postmaster had the new Lady Liberty/Flag Forever Booklet Panes of 20:

As most will know, this format of the stamps was just issued on 06/14/2011 and since the USPS had not mandated automatic distribution, post offices were advised to order their supply of these booklets only after the present Liberty Bell booklet stock gets depleted. In this case, the Postmaster told me that they were running low on their old supply of booklets and intentionally ordered these new ones.
Nothing too out of the ordinary from the ATM Booklet or Coil versions of the stamp except that I find it interesting that they have scored the margin where the plate number appears (presumably to aid in folding the booklet for a pocket or purse. I've never seen that arrangement before and it seems a bit odd and I suspect will displease plate number collectors:

Finally, when looking at the stamps on the reverse side of the booklet (in back of the label that appears on the front), there is an extra margin in the first two stamps. At first I thought it was a just a visual perception thing, but then I measured it and sure enough the first two vertical stamps measure 23mm wide whereas the other stamps in the booklet measure only 22.5mm wide. (The image size is unchanged).
So in essence there is an extra 0.5mm width in the first two stamps on the reverse side of these booklet only. Yet another minor variety to collect!
[Edit] Corrected date of issue. Stamps were issued 06/14/2011 (not 06/15/2011).