The best way to sell a wine is to give someone a sample of it. As much as I wish the Internet were a solution to everything, the fact that you can't taste a wine over the Net is inescapable.
But, here's a French winery using their Web site (alas, I don't read French) to get wine samples into the hands of potential customers by mail. They charge about $5 (3.90 euros) for a single 60 ml sample, which isn't as good as a free pour at the tasting bar, but not unreasonable, either. (The winery promotes their effort as a way to be greener, by keeping people out of their cars.)
Coupled with a video that leads a sample-drinker through a tasting of the wine, this isn't a bad idea.
And if you give the $5 back if they order the wine after sampling it, it shouldn't be too hard to convince people to give it a try.
The biggest obstacle for wineries (I would think), is the additional work of producing a sample-sized bottle of their wine. Please leave a comment if you know what's involved in this.