lol
To be honest i would not care less maybe someone had made a typo while he went on mining at an eligius like pool
Its just 0.07 btc so no big deal, if it was 50+ btc is would start to worry about some one had made a big mistake
And i really would stress if i would recieved a couple of thousands btc, but for these amounts its ok

I am not sure if you get some return when you send new and old btc to another address and it turnout to be a big portion old btc would you get such small refunds from the fee payed ....
Anway i will not sleep 1 second less about this amount, if it happened to me

The important point here is this, since I have hundreds and eventually thousands of btc's in my client. I want to know it is secure.
If coins can come in from who knows where. Can they go out to who knows where?
The only explanation so far is the typo from eligius, which seams extremely unlikely. I don't know the odds of actually getting a btc address by accident..