i agree this taking short or long, process, is all confusing to the layman.
Let me try to explain short and long, no promise it will be any better than others....
Shorting is selling something now that you don't own, but have borrowed. After a lapse of time, you buy the same stuff and pay back the one from whom you borrowed in the first place. This dual transaction of borrowing/selling now, and later buying/pay back, will benefit you if price falls in between, because you are selling when price is high, but buying it after price falls. If you do the reverse, it is long. So, short means you expect the price to fall, and long means you expect the price to go up.
In the case of Euros, shorting it would be like borrowing 1000 Euros now from someone, and sell it right away and receive Rs. 50000, assuming exchange rate is Rs. 50. A month later, suppose that Euro has fallen to Rs. 40. Let us also suppose that with fees and interest you now owe 1100 Euros on the 1000 you originally borrowed.
From the Rs. 50,000 proceeds you got from selling Euros when it was Rs. 50 to one Euro (let us ignore the interest you may have earned on the rupees), you now buy 1100 euros for Rs. 44,000 and pay back your loan. Well, with these two transactions you have made Rs. 50,000 - Rs. 44,000 = Rs. 6,000, with no investment on your part, a handsome return, don't you think?
Take these transactions to billions and billions of dollars and you will see the killing these greedy Wall Street SOBs made shorting mortgage based securities, leaving the poor and middle class holding the bag. This story has been repeated in human history over and over again. What is happening in Greece is only the latest.
Cheers, I think!