In the 1970s, a full Rolodex was the business professional’s best friend. A key item on any bigwig’s desk, this rotating file device was used to store business contact information on specially designed cards. In today’s technology-obsessed business world, these once must-have inventions serve as more of a paperweight than anything!

InventHelp’s Gadget Girl is learning that digital business cards are fast growing in popularity. More than 20 services allow people to exchange electronic business cards. Here’s a few of our favorite digital card inventions:

First, there’s SnapDat, a free iPhone application that enables iPhone addicts to send digital images of their business cards. This mobile contact sharing application keeps the familiar look and feel of a traditional business card, if you’re not quite ready to dive right into the digital trend.

If you’re a fan of Twitter, like many of us at InventHelp are, then TwtBizCard helps you to personalize and share your business card. Twitter fans can instantly start tweeting with the hash tag, #twtbizcard, or add #twtbizcard to an @reply.

If you’re drowning in a sea of business cards that you never use, CloudContacts is for you. Simply send them your paper business cards, and CloudContacts will scan, transcribe and connect your business cards on social networks, email services and CRM systems. Your contacts can be exported and viewed online in a variety of convenient formats.

InventHelp’s Gadget Girl doesn’t expect paper business cards to disappear anytime soon (I’ve got about a thousand in my desk!), but these web-based services make it easier than ever to keep your important contacts current and always accessible.

Welcome to the new age of professional networking!