Actually
That particular phrase is from game theory. In most games, one party wins, and the other loses - a game of cricket, for example, would be win-lose. However, some situations can be described as win-win, as both parties gain - exploration companies like to describe the discovery of oil as win-win, for both themselves and the local communities.

But you're right, it has been completely bastardised by the press to simply mean 'a pleasant surprise'.
(Clerk T Hazarde are all the wine, Sat 10 Apr 2010, 12:48, 2 replies)

I was going to put that
and feel smug yet nerdy at the same time.
( sandettie light vessel automatic New Twitter - @bollocksreally, Sat 10 Apr 2010, 13:12, closed)

this-this

( Moon Girl Technologies horrendous beanbag, Sat 10 Apr 2010, 14:09, closed)