I don't wish to start a philosophical discussion here, but one feature mandatory for me is the capacity to efficiently block ads when browsing, either at system level (through editing the hosts file for instance) or at browser and email levels. Is there such an experience here? For instance, is it easy to access and edit the hosts file, or is there something like an ad blocking service in the native browser, or in another one? As concerns the email program, is there for instance the possibility to "not download" images or other urls, leaving it to the user to decide on a case-by-case basis?
There are definitely a few adblock plugins/addons available for the android-based firefox browser and no doubt other android browsers like dolphin.
In terms of the native email application, I just opened a few spam emails which included images in the emails and the images didn't load. This may vary though as I haven't run in depth tests.
There should no doubt also be access to the .hosts file although I haven't found it yet and I'm not sure what the permissions are set to by default for editing.
On a side note, I appreciate the need to block adverts on some websites, but other valid content websites which are largely unfunded rely solely on revenue from a few harmless ads to pay for host fees etc. For example on our site, we run a few ads, but hope they don't detract from the overall experience. ;-)