I didn't get a case because I have the DSlite/DSi/3DS pouch from Club Nintendo NA. I've been pondering if I should get screen protectors or not, but I don't think I will -- never had them for my DSi/DS lite.
Also, that mini towel from club Nintendo is being put to good use, lol. Also, my phone is there.
I've updated the list above to include up to post 488. I will stop updating the list on April 27th (1 month after launch). I'd like to do a similar tally when the NGP is released and compare the results.