I started a similar thread for the 822 when I picked it up, so here's one for the 928. At this point, a lot of it is just generic stuff on Amazon, but as more specific accessories, especially cases, come out, I'll add them to this list. Please post accessories you find below, and I'll add them to this post so people don't have to search through many posts to find them.
Fantastic link Diego, I didn't jump on the offer posted on WPCentral because I didn't know for sure that the 928 would have built in wireless charging. I just ordered one from them now so I should have it just after I get my 928 on Thursday or Friday.
As for cases and stuff, I'm a little disappointed that there aren't any brand name cases for sale yet.
Those charging plates that WPC reported on, I picked up two. But for this thread, I'm going to try to stick with permanent sellers as far as what I put into the top post. Go ahead and share great deals here, but the permanent ones I'll stick into the top post.
Personally, I HATE these types of phone holders myself. I have 2 cup holders right in my center console that never get used. I think I will just figure out a way to mount the charger on the inside of the console somehow and run the charger off main power and not use a USB or cig lighter port. To me, dropping it into an unused cup holde is more convenient than one of those holders.
I just got this one by Acoustic Research the other day from Amazon. I got it $20 cheaper than this, in "used but like new condition." The box was torn just a bit. It was brand new, unused. If you're not looking for stereo necessarily, but looking for a good portable unit. It has BT, but it also has a 3.5mm plug that you can plug into your phone, and a compartment you can put the phone into, so you can carry the thing as a unit with the phone in it, protected. I've been using it while replacing my front porch, and I'm quite happy with it. Sam's has it for $76 or $78 IIRC.