Ooh, this thread's been bumped up again.
I made a find that I wanted to post: I found
a UK supplier for the Nyko PowerPak+ replacement battery (to my knowledge, they're currently the only one). They have them on-hand currently, and they're easy to fit. It's 2000mAh, instead of the stock 1300mAh, and it makes all the difference - the result is that it fixes the system's only real flaw, giving it a proper battery-life.
As for the eShop update, it's live here now, too. It's a bit slow to update, isn't it?