Two Cheers for Screw Caps: So says Professor Bainbridge, here, echoing a point that Flyer made when I saw him at Thanksgiving. If you aren't going to cellar the wine for 5 years, cork isn't necessary. And when cork is necessary, most people are storing the wines wrong anyway.
I worked in retail wine sales for a couple of years in the 90s, and I noticed that most stores don't even store their wine well. In some cases the customer's home storage system, even if it's just a clean basement, is better than the store's.