To give you an idea of the difference in pure numbers to yesterday, here is the cosplay area in comparison:
Was there for a while but it was hard to move, not even mentioning taking pictures. The ones I got:
After buying some stuff I left and visited the special exhibition of the Miraikan: How modern technology could realize the tools of Doraemon (a popular robotic cat who helps the protagonist with various tools he brought from the future). They had exhibits on brain analysis, automatic speech translation (Japanese to English, Chinese and Korean --> speech to text), meta-materials and much more. Of course it was designed to be interesting for kids, but the science behind the tools was explained in English and interesting.
On my way back I came by the Tokyo International Exchange Center Festival 2010, the center being right next to the Miraikan and all. They got a booth for every country their students come from, from Africa to France.
I won't attend the third and final day of Comiket 78 tomorrow, still got some stuff to do and quite enough of being stuck in a crowd for a while. All in all worth it, however ^^
So long and stay tuned,JuergenS