As we noted yesterday, AT&T is opening the door to third-party app stores on new Android devices, expanding beyond the official Android Market, as a way of giving users access to Amazon.com’s Android Appstore. But Amazon isn’t the only Android app store that stands to benefit from the change.

Happily riding on Amazon’s coattails is MiKandi — the Seattle-based adult app marketplace made famous when Apple CEO Steve Jobs derided the fact that there’s a “porn store” for Android devices. MiKandi co-founder Jesse Adams confirms via email that the newfound ability for AT&T Android users to check the box for “unknown sources” will allow them to access not just the Amazon Appstore the MiKandi store, as well.

Previously they needed to go through a sideloading workaround to use the MiKandi store.

The MiKandi team celebrated the change on its blog with a special graphic. (Don’t worry, it should be safe for work … probably.)

MiKandi also notes in its blog post that the news alleviates one concern arising from AT&T’s proposed T-Mobile USA acquisition:  “This serves as promising news given the recent announcement of AT&T’s acquisition of Android friendly T Mobile. Many customers and developers shared valid concerns over whether or not the acquisition would affect access to and distribution of third party applications.”

AT&T enabled third-party app stores starting with the Samsung Infuse 4G. Existing devices to be updated with the capability are the HTC Inspire 4G, Samsung Captivate, HTC Aria and the LG Thunder, according to the wireless company.

Previously on GeekWire: Apple hits adult ‘app store’ MiKandi with cease-and-desist over trademark

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