Merriam-Webster's Ask the Editors blog is the centerpiece of the Merriam-Webster's Learner's Dictionary site. It is an excellent source of sensible advice about English language and usage. Editor-at-large Peter Sokolowski also has a Twitter feed where he highlights various interesting things about words. Finally, Merriam-Webster has started producing Ask the Editor videos, four so far, where they've tackled the subjects of i before e, classical roots, affect vs. effect and how news stories affect what words people look up online, in this case focusing on the effect of the coverage of Michael Jackson's death. Incidentally, Merriam-Webster have released their top ten words of 2009 list, which is based on what words people looked up.
The influence of Edmund Spenser across two and a half centuries as traced through 25000 different texts
Spenser and the Tradition: English Poetry 1579-1830 is a mammoth database of English poetry and other writings that traces the influence of the great 16th-Century poet Edmund Spenser on English poetry across 250 years. There are roughly 25000 different texts on the site, over 6000 poems from famous classics to obscure ephemera, and further thousands of biographies and commentaries. Since it would take years to read all the material I am happy to say that there is a guide to navigating the database, an overview of its contents, a statistical summary and an essay on tradition and innovation. The immense database, which started life as a pile of index cards, was compiled largely by Virginia Tech Professor David Hill Radcliffe over the course of 17 years.
Japes for Owre Tymes is a blog that translates one newspaper comic strip a day into Middle English. "Why? Because it can..." If you want to try reading the translated strips but need a bit of help here's a Middle English dictionary.