With such limited screen space, aren't the lines between contextual advertising and interruptive advertising a bit blurred? I mean, if there's an ad on my phone screen then it's using space that I want to use for *my* stuff - I don't care how relevant it is.

Maybe what we need is the mobile equivalent of "press red for more" - a subtly advertised means of alerting users to the existing of further info, which they can choose to access, as opposed to shoving it on-screen and whining that it's "relevant".