I want to know how to configure two instances of the same OSGi service?

AEM supports pulling/inserting data from a relational database.For this use case -- you need to use DataSourcePool and write the service to perform database operations. See this AEM article as an example: Scott's Digital Community: Injecting a DataSourcePool Service into an Adobe Experience Manager ...

Where is the docs on how to use Lazybones?

I want to know how to connect to MySQL from AEM. Whats the best way. 

We know this in depth level of information on ecommerce is missing.We will be working with top community experts (both in and out of Adobe) to produce some strong dev articles around ecommerce. But as Jitendra pointed out - you can look at the Geometrixx outdoor website to see how it works. 

For Dynamic Media - these docs may help:http://docs.adobe.com/docs/en/aem/6-0/administer/integration/dynamic-media/enabling-dynamic-media.html

The out of the box Captcha component seems to have limitations as you pointed out. If you want to run on on the server - i would recommend that you build a custom one using a 3rd party solution -- such as:http://simplecaptcha.sourceforge.net/Because this is a Java API for generating these values - y...

We do not have an article on this exact use case - but our Touch UI expert replied:You need a validator on the widget something likehttp://experience-aem.blogspot.com/2015/08/aem-61-support-required-property-on-richtext-editor-rte-of-touchui.htmlHope this helps. 

thanks for posting your solution. 

Yes - you can extend TOuch UI components. I am looking to see if we have some articles on this.