Drop down list of country names
The point is that most of the time we don’t really care exactly which country the user is from.
My current plan for the OPC is to have two radio buttons (and one below the other, of course), one that says “India” and the other that says “Other: ” and has a text input form next to it.
Update [2008-07-08]: [Yes, that’s what we used, as I remember it, and it went well.]
It turns out that Peter-Paul Koch of quirksmode.org has already done this: Usable Forms