Mobile social network Loopt is making a big push this summer.

CEO Sam Altman already took stage at last week’s Stevenote prior to the unveiling of iPhone 3G. He was there to present the friend tracking software Loopt has been developing in time for the iPhone App Store launch on July 11th.

But while Altman describes Loopt’s iPhone version as the company’s best ever, he’s not overlooking the fact that many smartphone consumers still prefer the BlackBerry (and may even go for the BlackBerry Bold over the new iPhone). So Loopt is releasing software for BlackBerry devices as well, available here.

As with the iPhone, the BlackBerry software is free of charge. But unlike the iPhone, it will work on a variety of networks: Sprint, Alltel, T-Mobile, and AT&T.

See here for a full list of supported phones. Competitors include Whrrl, Brightkite, Zyb, and several others.