Code to check the available activated features on the server

http://stsadm.blogspot.com/2007/08/enumerate-features.html

Command to check SQL server connectivity

telnet < SERVER NAME > 1433

List of STSADM commands

http://blogs.technet.com/b/josebda/archive/2007/03/22/complete-reference-of-all-stsadm-commands-with-options-in-moss-2007.aspx

MCTS SharePoint 2010 Application Development 70-573 Study Guide

http://weshackett.spaces.live.com/blog/cns!41B731D6A8FE484A!463.entry