In this comment:
in the word "Citroën" the lower-case E-diaresis has been altered to a capital A-tilde. This happens when you preview a post too - example:
áéíóú âêîôû äëïöü
after previewing becomes:
ÃÃ©ÃÃÃ ÃÃÃ®ÃÃ ÃÃÃÃÃ¼
I was posting using Firefox 3.6.15 on Arch Linux, with no particularly odd or special extensions. I talk about cars quite a bit in posts, so I guess you could search down my previous posts to find the last time I posted the word with the correct ë symbol. This worked before, so it looks like some odd regression.