Hi!, thanks for the comments.
I'm not sure that the header is often accurate. My cousins in Israel (~16) use only the English version of Windows XP due to localisation problems. (Mixing of right-to-left Hebrew and left-to-right English programs, with the close button on the top-left *or* top-right of a dialog; everything backwards from screenshots with the tray on the bottom-left and start button on the bottom-right, trouble getting PC support from English speakers, etc)
Fine, the header might not be accurate. Your cousins use English version of Windows, so I guess they are able to understand English at least a bit. And although their preferred language would be Hebrew, they get English on Commons. But as soon as they create an account and log in, they can choose the language in preferences. No problem here. Fine, the header may not be perfect (but do you have a better idea?), but it is IMHO better than presenting English to _everyone_.
As long as language selection remains on the front page (and that will be up to the wikis), this would be fine for me.
The problem is not in the language of the contents, but in the language of interface. There are two reasons why you would visit, say, cs.wikipedia.org: Either you understand Czech and want to read something, or you want to e.g. insert interwiki links. For that, it would be fine if you would be able to create an account without any knowledge of Czech.
And, as I said, the biggest problem for me lies in the international wikis like Meta and (especially) Commons. Every anonymous user (= every user before he/she could get to creating an account) is offered English interface. How can we expect him/her to create an account, if he/she does not understand English at all? Should the help page in each language mention things like "click the second button from the right, then fill in the upper edit box, ..." ?
-- [[:cs:User:Mormegil | Petr Kadlec ]]