Here are the latest iPhone/iPod touch/iPod/iPad apps announced. You can find ’em at the Apple App Store (http://www.itunes.com/appstore/).

myYearbook, a place to meet new people and one of the 25 most-trafficked sites in the U.S., has announced the availability of its first iPhone application. myYearbook Chatter. It offers a free, real-time location-based stream that receives over one million posts per day.

Booyah, developer and publisher of the location-based MyTown  app, has updated it to version 4.0. The free app delves further into the intersection of the real world and the virtual world in the latest version.

Greg Hughes has released Wi-Fi Sync, a wireless syncing application for the iPhone, iPod touch and iPad. It’s available at a promotional sale price of $4.99. On June 11, the application returns to its $9.99 retail cost.

Pix Rev Srl has launched Polly Bad Dream 1.0 for iPhone and iPod touch users. The $0.99 escape adventure action game calls for players to help little Polly make it past the scary obstacles of her nightmares en route to her parents’ bedroom and safety. Polly’s nemeses are toys by day, monsters by night, thanks to the tot’s vivid imagination and fear of the dark. Users can help poor Polly by killing the monsters to give the girl the ability to fly, crouch or jump past the horror of her troubled sleep.

Andrew Kazmierski has unveiled Ruler 1.0, a $0.99 digital ruler for iPhone, iPad and iPod touch devices. To accurately measure objects larger than your device, the app features a movable marker that snaps.

Bal Seal Engineering, developer of the LKS Seal for high pressure/velocity environments, has released a free iPhone/iPod touch/iPad app that lets engineers estimate “PV” and seal performance life based on their own unique requirements.

Avallon Alliance has announced Cassandra’s Journey: Legacy of Nostradamus HD 1.3.3, an update to its $3.99 adventure and puzzle game for iPad devices.

TapFactory has released version 3.0 of Stick It, their $0.99 sticky notes app for the iPhone, iPod touch and iPad.

Intersog LLC has launched 101 Financial Solutions 1.8, a $29.99 mLearning application for iPhone, iPad and iPod touch users. It’s divided into three distinct sections: course, flashcards and tests. The full-text course book contains 14 chapters that cover various facets of personal finance. To help users with terms they may not understand, a course glossary is provided for easy access to definitions from within the app.

Esa Helttula has unveiled Long Division 1.4, a update to the $1.99 educational math app for the iPhone and iPod touch. The new version allows the user to teach and study long division problems step by step and animates all the steps. The user can now input custom numbers to divide or use random problems like before.

Treebune srl has unleashed Pushme.to 2.0, an update of its free messenger app for the iPhone, iPad and iPod touch. It brings free instant messaging to your iPhone and web browser, for real-time communication.

SimpLabs has rolled out Diet2Go 1.2, an update of the free weight-loss app for the iPhone and iPod touch. After choosing your plan from a large database, you can adjust your meal schedule and have meal reminders integrated directly into your iPhone calendar. The app offers additional weight-loss tips and tricks, as well as recommendations and success-estimates and much more.

Appmaker e.K has published a new version (1.2) of My Own Diary HD, a $2.99 dairy app for the iPad. The new version has been extended to include an export function that
allows you to back up all of your diary entries, and to select specific entries and export them as PDF or text files. Exports can be made either via iTunes’ own file sharing system, or by email.