Along these lines - are there any good 'hacker' tools out there for the various phone platforms? I know there are port scanners and some other things out there but is this a well-developed space?
On Android, apart from being able to run Backtrack on certain Android devices you have tools to MITM WiFi and other fun stuff (on rooted phones) and there is some movement in making it into a developed product, e.g. ANTI: http://www.zimperium.com/Android_Network_Toolkit.html
Depends what you're interested in, but as an iOS developer I highly recommend Jonathan Zdziarski's "Hacking and Securing iOS Applications", published by O'Reilly. It's a good primer, and covers a wide variety of both exploits and hacks.
