Four years after it first became available for PC users, Google has released a Mac version of its photo album application, Picasa, at Macworld in San Francisco for Mac users.

According to Google, the new application that hopes to challenge Apple's iPhoto photo album software will "help with nearly every aspect of owning and operating a digital camera".

While the company has previously offered both a standalone Picasa Web Albums uploader and an iPhoto plugin for Mac users, Picasa for Mac finally plans to bring all of the advanced sharing and sync features of Picasa to the millions of Mac OS X users who use Picasa Web Albums say Google.

Picasa for Mac will look and work like Picasa on other platforms. To run Picasa, you'll need an Intel-based Mac running Mac OS X 10.4 and above.