Yahoo has unveiled a new personalized mobile web content management utility called onePlace. The tool, which will be launched in the second quarter of 2008 as part of Yahoo Go 3.0 (a previously announced mobile application that enables easy access to existing mobile Yahoo services), will be able to track on mobile devices emails, news feeds, web sites, videos, search queries and more.

This means you’ll be able to manage My Yahoo feeds, stock portfolios, Flickr photos and even keep an eye on YouTube, Digg, Facebook and many other sites. Marking content will be as easy as bookmarking it in a browser, according to a company statement. And all web content will be able to be tagged, allowing disparate items to be categorized in a flexible manner.

If onePlace is user-friendly, it will be a powerful force in mobile content aggregation. With Google and Microsoft starting to ramp up their mobile online offerings, this is one area where Yahoo needs to flex their muscle.