Dirty memory use in iOS
<p>My app uses about 50 MB of memory at startup when I look at dirty memory using the VM Tracker instrument.  It's a pretty simple app, and from what I recall at WWDC this year, this seems like way too much memory use for an app with only one simple UIWebview at startup.  </p>

<p>I think I recall someone from Apple telling me to keep my memory use below 20MB as a guideline.  </p>

<p>Before I go off and try to track this down - what's a good target to keep performance smooth and mem warnings reasonable?  </p>
