Today was a day of combo-mapping:
1) Yahoo overlay,
2) Surveying on foot with a camera and paper,
3) and looking from the roof of my house!

At least I managed to get a decent start.
Things will get easier with the GPS logger that I ordered...

P.S:
The names on the street signs here are all in capital letters like this:

ΟΔΟΣ ΑΓΙΩΝ ΠΑΝΤΩΝ

I wonder if it would make sense, to tag them like this:

name=ΟΔΟΣ ΑΓΙΩΝ ΠΑΝΤΩΝ (what is written on the street sign > Easy to recognise!)
name:gr=Οδός Αγίων Πάντων (the correct name written properly)
name:en=Odos Agion Panton (English transliteration)
translation:en=All Saints Road (maybe English translation?? Is there a consensus on this?)