They should add an rss feed for PragPub only or email delivery with a newsletter (i keep forgetting to check for the new issue and i guess i'm not alone).
It would be especially nice if an ebook series such as this could automatically be delivered to my ebook reader of choice.
I believe that Instapaper offers something like this for the Kindle; I wonder if this is doable with iBooks?
They could send the book (maybe in .mobi format so the no conversion would be necessary) directly to your kindle email address.