It appears that all of the Calgary Vipers players from the 2011 season have become free agents as none of the players had their options picked up by the team:
The article states that the front office staff has been let go and the 2011 team manager, Morgan Burkhart, already has found another position. Should there be a Calgary team in the NAL or another league in 2012 then it will be reported on this site.
There are several good books about the independent professional baseball leagues. You are welcome to see a list of suggestions through this link: Books Get notified of upcoming independent baseball tryouts from either of these services: first service or the second service. Prospective players can find some helpful resources here We will be providing a growing list of possibly helpful tips and suggestions on various baseball information. This will range from "how to" information about baseball skills all the way to helpful information for casual baseball fans. Please click the link for more information: Tips And How To Information