Malwarebytes Anti-Malware:
http://market.android.com/details?id=org.malwarebytes.antimalware seems to be a reasonable enough security app. It identifies what apps are running, which apps have access to various permissions (accounts, messages, etc) and does a search for malware.
It didn't find any malware on my phone so I guess I can sleep at night. :what:
It's worth installing, just to get a look at running apps and the various permissions they have access to, but it's not something that'll remain on my phone.
With that said, their PC product has been absolutely essential - I'm often asked to help people clean up their computer and that's one of the first tools I run. YMMV.
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