One of the big successes of the App Store has no doubt been Ocarina, developed by Smule, who last week took part in Apple's iPhone OS 3.0 event to demonstrate their latest musical app, "Leaf Trombone". Ocarina transforms any iPhone into a musical instrument that can be controlled using the touchscreen and by blowing into the microphone.

It's not hard to imagine that you may be living on a budget nowadays, and keeping a good eye on where your money goes can make great improvements to savings. If you haven't already made yourself an exciting spreadsheet for this purpose, OS X has always had the money management app Cha-Ching - of which now there is an App Store counterpart - Cha-Ching Touch ($2.99, App Store).

Developer Nitako has released Rasta Monkey ($2.99, App Store), a physics platformer featuring a Rastafarian monkey who must navigate across trees, collecting fruit for an older Rastafarian monkey in need of 'fruit-shake.' The developer claims that Rasta Monkey is "by far the best iPhone 2D action platformer out there". Who can resist reviewing a title with such an aggressively confident marketing quote?

Wordpress (Free, App Store) for iPhone has been updated to 1.2, bringing some new features to the portable blogging app. The popular online publishing system that allows people to start and maintain their own blog, with Wordpress for iPhone allowing users to update their blog while away from a computer.

Konami's Metal Gear Solid has finally been released onto the App Store as Metal Gear Solid Touch ($7.99, App Store), a touch shooter set in the universe of Metal Gear Solid 4.

The popular iPhone book reader Classics ($2.99, App Store has been updated to version 1.2, bringing with it new features and books for those who have long ago left the world of 'paper'.

ngmoco's Rolando ($4.99, App Store) was updated to version 1.1 this weekend, adding new content, enhancements and options to the game.

As the App Store offers more and more ways to entertain iPhone and iPod Touches, there are also more and more apps being created to help people with their daily tasks - shopping, for instance. There are a lot of Shopping List apps for the iPhone (and many people find they can just get by with Apple's own Notes), but for the true power shoppers there is now Groceries ($2.99, App Store) from Sophiestication Software, also known for Tipulator, which we recently covered.

ngmoco last week released Topple Too ($2.99, App Store), the sequel to their block stacking game Topple which formed part of their debut onto the App Store, along with Mazefinger.

Apple on Wednesday quietly updated Remote (Free, App Store) to give the iPhone app support for the company's impending iTunes 8.1 release.