Being an NASB fan (but still using KJV on my computers and mobile devices because of the copyright issues) I’m excited to see that the ESV’s copyright is much less restrictive.
I use an iPhone, Blackberry, Windows, OSX, and Linux so it’s just not practical to purchase the NASB for each and every operating system. The ESV can be downloaded for free with programs like BibleDesktop, e-Sword, GnomeSword, etc. and the ESV has opened up an API for developers to access the ESV directly… resulting in webapps that are usable on mobile phones (the offical ESV Mobile website works great on BB, and iBibleSpace for the iPhone)
With fewer restrictions, an ESV Study Bible coming out later this year, and better covers Crossway Bibles is going to give the Lockman Foundation some serious competition.