Mark,

You might want to check out: PortLovers.com , they are very serious about their ports over there and they have forums so you can request more info if they don't have any posted.

I believe 'Colheita' is a specific kind of port wine, produced from garpes harvested during a single year and aged a minimum of 7 years in oak barrels. I also am pretty sure 'Moreiras' are from Portugal.

Cheers!