Just registered via IE 8 on an old computer (thanks, Dustin!).
Last year, I used IE 8, but couldn't participate in the on-line discussions. (I could submit questions which I know got through--a couple of them got read, but I couldn't see what everyone else was saying on-line).
I hesitate to install Chrome as there have been several reports that it behaves badly when you try to uninstall it.
Globally, IE still accounts for nearly 50% of users, while Chrome remains somewhere around 20% (even in Europe, where Firefox edges IE by a nose).
It just doesn't make sense not to make sure the EMC website isn't 100% compatible with the latest versions of IE. (I emailed EMC with the suggestion to check IE 9.0 compatibility).
Ah, well--I hope to participate in EMC with my ipad2 anyway! :)