You will remember that Apple has applied to the USPTO for registration of the mark "APP STORE". Dedicated readers of this blog were informed in January that Microsoft was opposing the issuance of such mark for Apple.
Amazon.com is now allegedly using the term "APP STORE" to solicit software developers for future software development and distribution. Apple is having none of that and has filed suit in the Northern District of California alleging that such use by Amazon.com constitutes trademark infringement and several other heinous sins. The suit asks for injunctive relief, damages, a constructive trust and attorneys' fees.
It is evident that "APP STORE" has become part of the popular lexicon and if one party is entitled to use it to the exclusion of others, it is a very valuable property. The holy trinity (Apple, Microsoft and Amazon.com) will continue to duke it out over this issue and the birds will just get angrier.