It looks like purchasing of Gyft.com gift cards is not limited to Android phone users any more.
Gyft has now added the ability to purchase gift cards using Bitcoins directly from it's website:
http://www.gyft.com/(Click the link reading "NEW! Buy cards with Bitcoin")
Direct link:
http://app.gyft.com/me/cards/purchase/I can buy using their web site, but can I spend (in which I first need to get the gift card number, using the reveal process) using the web or do I need an Android for that?