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Isn't the obvious 80% solution a separate cookie that just says "this browser last logged in using service X" that the server can use to give UI cues?

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With single device - you're right... but this becomes really a problem when you expect your customers to use multiple devices: computers at home, at work, smartphone, iPad...

how would you suggest your customer which login to use the first time she tries to sign in on another device?

Ask for username/email, then key off that. 80% solved.

Would that be my personal email account, my gmail account, my other gmail account, my university/alumni address, my work email or the other work email?

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