I've just visited the android market website from my work computer and the website is displaying in German. For what it's worth, I have an Ubuntu box and tried in both Firefox and Chrome (both browsers have en_GB as the first language preference followed by en). I suspect the website tries to be clever and uses my IP address instead of the browser's language settings - all PCs at work (no matter which country) are set to a German IP range.
Is there a request parameter I can add to the URL (or something else) that will force the language to English?