Gang,

I know, there’s a hotter market for day-old doughnuts than for day-old news. But just scan the headlines below: major mobile marketplace eruptions that have occurred this week. We are entering an astounding time of “mobile value growth” in all corners.

Foursquare Courts Business Users with Checkin Analysis Features

All local retailers, read this one: Up-to-the-second IDs & stats on your in-store visitors, coming from Foursquare.

Thanks to Mashable’s Jennifer Van Grove:

At the end of the day, the business features further contribute to Foursquare changing the world as we know it.

iPad Pre-Orders Begin at 5:30 A.M. PT on March 12 (today)

Thanks to Mashable’s Samuel Axon

Google Mobile Product Search Now Does Local Inventory Check

Thanks to Mashable’s Christina Warren

Barnes & Noble to Launch E-Reader App for iPad

Thanks to Mashable’s Barb Dybwad

Twitter’s Website Now Attaches Location to Tweets [PICS]

Thanks to the reason I started reading Mashable The Social Media Guide in the first place, their Co-Editor Ben Parr

Google Apps Marketplace: 6 Great Apps to Try Now

Google launched the Google Apps Marketplace Wednesday night. This could become a significant enterprise app ecosystem connecting desktop and mobile. The evening of the launch, I counted just nine Financial apps. Hah. Just wait.

Thanks to Mashable’s Christina Warren

Google Fiber Sparks Online Competition Between Cities Nationwide

Thanks to Mashable’s Features Editor Josh Catone

YouTube Embracing Mobile Marketing

Thanks to Mobile Marketing Watch: Posted by michael on Mar 12, 2010 in In The News, Mobile Advertising, Mobile Marketing,Mobile Websites

Facebook, Twitter, Foursquare Face Off in Location-based Services

Thanks to Mobile Marketing Watch osted by Adena on Mar 10, 2010 in Mobile Marketing

Digital Ad Spend to Surpass Print in 2010 for First Time

Thanks to Mobile Marketing Watch: Posted by Adena on Mar 8, 2010 in Announcements, Content Publishing, Featured, In The News, Mobile Marketing

Alabama Represents the “State” of Mobile

Thanks to the good gang at Mobile Marketing Watch: Posted by michael on Mar 10, 2010 in In The News, Mobile Marketing, Mobile Resources,apple app store, iPhone

Target Stores to Bring Mobile Coupons Mainstream

Thanks to the good gang at Mobile Marketing Watch: Posted by Adena on Mar 9, 2010 in Mobile Marketing

And take your pick of great mobile announcement headline news for the last week at FierceWireless.

But here’s my Favorite of the week’s announcements for mobile app developers: The relaunch of AppBoy – Dashboard, Apps, Ideas:

Appboy is a social outlet for mobile app lovers. Got a great app or a unique idea? Get feedback and use our community to get the word out.

Thanks to Mashable’s Christina Warren for her Appboy update coverage.