Great software!
I just purchased the ESV and NASB. While reading in Hebrews, one of the verses referenced a verse in the Psalms... and I had to use the search function to type in the words and find the original passage.
It is much needed for you to provide some sort of cross reference system -- preferably the Treasury of Scripture Knowledge. This could be available as one of the options when you click on a verse.
Please tell me if this is a feature you are planning to add.
Thanks!