<p>I would like to begin developing for the Blackberry platform and, specifically, the Bold and also the Storm device which is coming out soon.  Do I need to get into Java and J2ME or can I develop sites in ASP.NET and just keep utilizing the skills I already have?  </p>

<p>I am completely new to mobile platform development and have no idea what it will take to target these Blackberry devices.  I am hoping to continue to use my ASP skills.</p>

Are you talking about websites (because you say "develop sites in ASP.NET") or native Blackberry applications (because you say "developing for the Blackberry platform")?
Applications which run on the Blackberry use J2ME. If your application is accessed from a browser on the Blackberry, then it's the server the web app runs on that determines the language, not that it's being accessed from the Blackberry browser.
Then there's Blackberry MDS for integration with enterprise apps. I don't know much about this (never used it or seen an application that uses it) but it's described here:
http://na.blackberry.com/eng/services/mobile.jsp
Paul