If you are building a WP7 application you really, really need to look into obfuscating your .xap prior to submission. For the time being PreEmptive is giving away a license of their Dotfuscator for WP7 usage. Running the tool via the UI is simple and easy, I want to obfuscate our .xap EVERY NIGHT via our build process.
The real good news for us is that PreEmptive has made this process very easy, check out the online docs for how. What I have done is wrapped this in a very simple Nant script to help everyone along.
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Post Contributed by: Kunal Chowdhury
Kunal is the Site Admin and Contributor of Silverlight-Zone. He is a Software Engineer, Microsoft Silverlight MVP, Code Project Mentor and a Code Project MVP. He is also an active Author in SilverlightShow.net and a speaker in various community events. He works on Microsoft Platform and very passionate about Silverlight technology. He started his career in 2007 and achieved various awards during his professional life.
He shares his findings in his personal blog: http://www.kunal-chowdhury.com and he also tweets at: @kunal2383.