Ok, I figured it out. Apparently SONY in their finite wisdom added the requirement that only one PSP on your account can load the comics so:
On your PSP go to Account Management -> System Activation and select "Video/Comics" (comics was not there before ...) and activate it (if you already had video active i recommend deactivating and then reactivating it)
NOTE: If you already dl'd some of the comics you can not reenter that code but you can go to your download list (under transaction management) and redownload them (which is painfully slow due to the 802.11b but i digress...) I just finished the fourth download.
just in case you missed them the four dl's for the US playstation store only are:
Remember that if any of the above are already in your "Account Management ->Transaction Management->Download List" you will have to dl them from the Download List as the PSN will not allow you to put a code in more than once.
I'm not really sure, I don't remember activating video on my psp2k but i noticed the new entry for comics when i went to activate my PSP GO which arrived at 7pm tonite courtesy of UPS... and immediately realized that that was the problem, i am pretty sure sony added that option with the 6.20 firmware. Sigh!
They have come a long way but sadly they still have a long way to go with their software...
If you've already redeemed the codes when having these problems, then on the PSP (and NOT in the store itself) go to Account Management, Transaction History (I believe) and get your downloads from there.
If this doesn't work, dunno.