Used to be you could easily exchange contact information between handhelds through an infrared connection. While, in some instances, you can still do this wirelessly over Bluetooth, to do so is often a hassle. Enter DubMeNow, which today added an instant-exchange feature to its DUB app for sharing business card information from an iPhone or BlackBerry.

Additional enhancements in the latest version of DUB include the ability to add a photo and social networking information to your contact data. It also now lets folks send a LinkedIn invitation with their contact info.

Called Locate, the new instant-exchange element of DUB allows smartphoners to exchange contact data—such as e-mail, phone, address, photo, etc. and links to their social networks (e.g. Facebook, LinkedIn, Twitter, blogs and more)—using their current location with the push of button.

Here's how Locate works:

When two people meet they open the DUB application and click the 'Locate' button. DUB will then locate both users and prompt them to exchange virtual business cards.

The other person’s contact information is then automatically saved directly to their mobile address book. Once the exchange has been made, the contact's info always stays current, as DUB automatically updates a user's mobile address book anytime a person updates their information (new e-mail, phone, social network, etc.).

Below is a video showing how DUB works:

To download DUB, which free, to a BlackBerry point your browser to m.dubmenow.com. To get it for the iPhone head over here at the iTunes App Store. A version of this app is available for Google Android-run phones as well.