Google tweeted from its @AndroidDev Twitter account that the company’s Android Market has surpassed 100,000 downloadable apps.

As more developers hop on the Android train, the number of apps in the Android Market has grown almost exponentially. It was just seven months ago that the Android Market reported 30,000 downloadable apps.

By comparison, Apple’s App Store currently offers just under 300,000 downloadable apps. It took the App Store just under 500 days to reach the 100,000 mark, while it took the Android Market just under 800 days to reach that same milestone.

Google’s open-source Android operating system has seen tremendous growth over the past year, supplanting even Apple’s iOS in U.S. mobile operating system market share. Android has been helped along by OEMs like Motorola and HTC, both of which have built popular smartphones around Google’s OS.

Google has released a new piece of software called App Inventor that allows lay users to create relatively complex mobile applications for the Android platform. According to a blog posted on Google’s website, the new system will allow users who don’t know a shred of programming to create apps by dragging and dropping commonly used “blocks” of Java code into a template.

App Inventor allows users to create apps that are sophisticated enough that they can store data created by users in a database. Users also can create apps that use GPS location information and automatically send text messages.

The blocks editor uses the Open Blocks Java library for creating visual blocks programming languages. Open Blocks is distributed by the Massachusetts Institute of Technology’s Scheller Teacher Education Program and derives from thesis research by Ricarose Roque. Open Blocks visual programming is closely related to the Scratch programming language, a project of the MIT Media Laboratory’s Lifelong Kindergarten Group.

The compiler that translates the visual blocks language for implementation on Android uses the Kawa Language Framework and Kawa’s dialect of the Scheme programming language, developed by Per Bothner and distributed as part of the Gnu Operating System by the Free Software Foundation.

Google Voice has overcome two of its biggest obstacles to mass adoption: a way onto the iPhone, as well as a way for subscribers to use the service without changing their number.
The move essentially robs the carrier of any hand in hosting voicemail services for their customers. The Internet giant last night said that Google Voice subscribers can use Google Voicemail without changing their phone number.
The new service provides a backdoor onto the iPhone by allowing users to reroute their carrier voicemail to a Google Voice account. In the past, Google Voice subscribers have had to commit to a new phone number, which many users were reluctant to do.
Google Voice features are limited for those who choose to keep their legacy number and forgo the unique Google Voice number. Those who keep their legacy number will not be able to forward calls to other phones, conference call, record calls or send text messages.
Nevertheless, even the limited Google Voicemail features represent an enhancement to standard carrier services. Google Voice subscribers who keep their legacy number are still provided with visual voicemail (voice to text) and custom voice greetings for specific callers.
While the new service does tap the iPhone in a limited sense, it’s still no replacement for a Google Voice App. Wireless Week did limited testing of the new service on the iPhone. The individualized messages for specific callers worked well. However, the visual voicemail translation is simply not accurate enough to rely upon. For lack of a Google Voice App, iPhone users who want to listen to their voicemails will still have to open a separate browser window in order to listen to each message saved to their account.
Apple, Google and AT&T have been embroiled in an FCC inquiry into Apple’s rejection of the Google Voice app from Apple’s App Store. Apple said it had not rejected the application but was holding it for further review. Later, Google produced a letter that said that Apple rejected the app because it did not want applications that “duplicated the core dialer functionality of the iPhone.”
As of press time, AT&T had not released a response to the new service. The service requires a Google Voice account and that users dial a long code from their phone to activate the voicemail service.