The Ultimate Productivity Blog
I found this at the excellent Twitter site of Michael Nielsen, recommended by an MR reader. He also refers us to this interesting article on neurology and athletic performance and this piece on the surprises of mathematics.
Here is his blog and here is his blog post on the future of scientific journals. Here is Michael on the future of science.
Most of all, I like his six rules for rewriting.
Hail Michael Nielsen, who justifies Twitter all on his own.