I stupidly didn't register my remaining games last week so I tried last night with the site choking on itself. Here's a hint that may help: try logging in around 4am EST. Traffic is much lighter so I was able to register my games with minimal issues. It was still slower than normal and I had to deal with a few snags. Still, I hit Platinum about an hour and a half ago. I still have to do the post-game surveys in a couple days. Of course, it helps that I was awake anyway since my shift starts at 5am now (it's a lot more awesome than it sounds).
I'm a big supporter of Club Nintendo as a rewards program. Still, I can admit that it functioned poorly under stress. I get the impression that the physical rewards will not run out. Based on the oddly egregious shipping time, it seems like Nintendo is taking all the orders then manufacturing the items which (ignoring that it would have been nice if it did that before) is the fairest way of handling the end of the Club Nintendo rewards program. This way, everyone has a shot of scoring physical rewards.
Besides Paper Mario, I haven't decided what rewards I want. Right now, I have about 1300 coins. I have the post-game surveys on five games, and I may still have another game or two to register.