Custom drush commands

I wrote several custom drush commands back in version 2. The commands help with setup/archive/tear-down for my companies development environment. My problem is some commands have been acting finicky since the update to 3.1 . Mainly having to do with the hook_drush_command array. Some commands will only run when I set the callback key/value. Others will get stuck in recursive loops or run multiple functions (that I did not call), if callback is set. What gives? Is there any documentation for difference in defining a drush command between 2 and 3?

B/w thanks for an awesome module. It has saved me sooooo much time.