Last week when I was slicing an awesome theme design from Veerle Pieters for Fork CMS, I ran into a problem with the Chunk font. Like with French, we also have some special characters such as "ë" in Dutch.
Unfortunately, the character set for @font-face use is pretty limited so I had to look for another solution which I found here. There's this French guy who added those special characters missing from the Chunk font to be able to use it for languagues which use those special characters with accents; big thumbs up!
Of course it would be even better when the League of Moveable Type would be so kind to add these characters to the webfont character set and give the awesome Chunk font an official update.