Just for comparison with the previous post about anime popularity in Japan, here is a rough guide to the popularity of the new season's anime outside Japan. The index I'm using is the number of posts for each title on the AnimeSuki Forums.
Clearly this is very rough, especially since half the shows haven't even been subbed yet (if they ever will be). Unsubbed shows in red:
Kyoushirou to Towa no Sora 556
Shuffle! Memories 367+
Manabi Straight 253
Nodame Cantabile 238
Venus Versus Virus 205
Les Miserables 95 (sub just released)
Hidamari Sketch 69
Deltora Quest 65
Saint October 64
Getsumen To Heiki Miina 56 (sub just released)
Yes! Precure 5 20 (sub just released)
Master of Epic 7
Here, Kyoushirou to Towa no Sora is the clear favorite, with Shuffle! Memories second, and Nodame Cantabile very close to Manabi Straight for third place. For an unsubbed show, there is a lot of interest in Les Miserables, but many of those posts came before the show started.
EDIT: In his comment (below) adding information about Korean popularity, based on number of subs, wontaek indirectly reminded me that my title is a bit misleading. Rather than changing the title to "Popularity in the West," I thought I'd add some info on popularity in the Chinese-speaking world.
I used wontaek's method of judging by number of groups subbing each show. The numbers are approximate, based on a quick search of Greedland, which is the most inclusive Chinese anime bt site I know. Hold on to your hats. These numbers will seem very high to people who don't know how active the Chinese subbing community is:
Shuffle Memories 14
Kyoushirou to Towa no Sora 13
Manabi Straight 11
Getsumen To Heiki Miina 11
Hidamari Sketch 8
Saint October 8
Nodame Cantabile 7
Venus Versus Virus 7
Tokyo Majin Gakuen 7
Les Miserables 5
Yes! Precure 5 1 (so far; it just started)
Master of Epic 1
Deltora Quest 0 (I don't know what it's called in Chinese, so I'm not sure)
These numbers represent number of groups that have subbed at least one episode of a series. I didn't take the time to judge how many have kept on, but it's definitely the great majority.
The show that stands out here is Getsumen To Heiki Miina, with its 11 sub groups. This shows a level of interest even higher than in Japan. Those who are eagerly awaiting the first English sub of Hidamari Sketch will be impressed -- or perhaps depressed -- by the fact that there are eight groups subbing it in Chinese.