While not actually a hardware thing, this recently crossed my mind:

Store/repository features

• no geographic blocks by default, developers can select geographic avalability if they want to
• for paid apps - wide range of payment methods (PayPal, carrier billing, global CC, Google checkout, Amazon Payments, Flattr,...)
• for free apps - built in donation support (like for example in Mozillas addons repository)
• scan-Qr-code-to-install support
• possibility to respond to user feedback
• quick QA
• show changelog

Based on my experience with WebOS software catalog (implicit region locks + payments only by US,UK & GE credit cards, even though developers are paid using PayPal), PlayStore (no PayPal) and Ovi (no changelog, not possible to respond to user feedback).