It was a long wait but it was well worth it! As part of its Spring Release announcements, Windows Azure is now available in 48 new countries, including Argentina!!
Yes, you can now go ahead and register with your local credit card and even start a 90-day free trial in www.windowsazure.com and if you are in Argentina next Thursday June 14th, you should definitely register in the Windows Azure Dev Camp that will cover the new features!
You can also register to try the new services as well:
As we mentioned earlier, in addition to the availability in these new geographies, some great new features and services were announced today, including: Windows Azure Virtual Machines, Windows Azure Virtual Network, Windows Azure Web Sites and New tools, language support and SDK.
Here's a great summary blog post: http://blogs.msdn.com/b/windowsazure/archive/2012/06/07/now-available-new-services-and-enhancements-to-windows-azure.aspx