There are so many foreign wineries now producing and distributing their own labels you almost need to have a guide for each country. Though it makes for fun research , drinking and discussing!

To really know Italian wines see Made-in-Italy. It's Italian wine reviews section really breaks down Italy's wine from major Regions to sub-regions and includes virtually all the numbers and statistics you could imagine. If I had a page like this from every wine producing region I would never have to gamble on an expensive bottle of wine!

For New Zealand wines a very useful guide is New Zealand Wine Regions Page It's simplified interface that makes finding out about any New Zealand winery easy.

If you know of any useful wine references, Please blog to this post. I am trying to put together a comprehensive list. I still need France and Spain/Portugal.