St. Louis-based mother-son team Spearhead Development has updated its QR Card Us product in response to customer feedback, cranking out a new iteration in just one week. We covered the launch of the mobile Web-powered business card provider on August 18.

The new version of QR Card Us separates the QR link itself from the 'hard card,' or physical business card, so that customers can buy standalone QR Cards - mobile-friendly Web pages from which contact info can be saved - without worrying about their physical cards becoming outdated. It also adds Organizations, which allow a moderator to manage QR Cards for a company, club or any kind of group. Finally, the update adds Notes, which lets users attach any kind of text note about a new contact to their saved info.

An annual $15 fee provides ongoing support for the QR Card, which can be updated anytime, to which the QR code is a permanent link. Buying a standalone QR Card allows customers to put their code wherever they want, such as their own branded materials. Customers can also purchase 'hard cards,' or physical business cards, for a one-time printing fee, alongside the $15 annual charge for the Web-based card. Customers can order new hard cards without affecting the subscription for the Web card.

While QR Card Us provides color, layout and typography choices for both the physical and Web cards, many prospective customers requested more control over their own brand. Thanks to the power of Web-based communication, the flexibility of the small team and the online core of QR Card Us, Spearhead Dev was able to iterate quickly to respond to these concerns within a week.

To learn more about QR Card Us, check out our initial post, in which 19-year-old co-founder Michael Schade describes his vision of "making technology accessible for everyone." Also make sure to visit their website at qrcard.us.

We've also covered lots of different ways mobile Web technologies have been applied to business and personal networking, which you can explore here.

Have you ever used a mobile business card reader for networking? Tell us about it in the comments.