Butterick’s Practical Typography

Outside our linguistic remit. But related, full of sound advice, and everything you'd need to know as a writer.

http://practicaltypography.com/index.html#toc

Grimm Scholarship: The First Sound Shift

Grimm's Law illustrated here: cognates in earlier languages show pretty consistent kinds of shift into Germanic languages, including English.

http://web.cn.edu/kwheeler/IE_Main5_Grimm.html

English Cognates in French

This comes up in discussion about etymology, and language change in the A2 year. Of course, it works the other way round.

English Cognates
http://french.about.com/od/vocabulary/a/vraisamis-x.htm