The BlackBerry Partners Fund LP, a $150 million venture capital fund formed to focus on applications and services for the BlackBerry and other mobile platforms, announced Wednesday that the fund has made investments in buzzd, Digby and WorldMate.

“Today, we are announcing investments in companies that are leaders in the mobile application marketplace,” says John Albright, co-managing partner of the fund.

Buzzd, a location-sensitive city guide and social network for mobile devices, has raised $3.2 million in a Series A Preferred Stock financing with BlackBerry Partners Fund, Greycroft Partners, Monitor Ventures and Qualcomm Ventures.

Digby, a leading mobile commerce service provider, has raised $5.5 million Series B Preferred Stock with the BlackBerry Partners Fund and existing shareholders.

WorldMate, a company that has paved the way for mobile travel innovation and serves over one million frequent flyers and road warriors around the world, has raised $8 million in a Series C Preferred Stock financing with BlackBerry Partners Fund, Motorola Ventures and AMC Communications.