The new critical edition of the Greek New Testament (put together by SBL and Logos Bible Software) is now available for download. The new edition is called SBLGNT.
The text is currently available to download for Logos, in pdf format (oops… pdf is not available yet), in XML format, and in plain text. It looks like SBLGNT will soon be available at Biblia.com and as an iPhone app. (What about Android?)
I haven’t had time to look at it yet, but I hope to compare it to the NA/UBS text soon.