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The ROS_PACKAGE_PATH in your case includes all entries in /home/sai/fuerte_workspace/.rosinstall you can manage this file using rosws: www.ros.org/wiki/rosws
The ROS_PACKAGE_PATH can be very long, no problem. But all the paths in ROS_PACKAGE_PATH should exist, else they can be deleted.
The shortened ROS_PACKAGE path you posted does not include
/home/sai/fuerte_workspace/turtlebot_driver:/home/sai/fuerte_workspace/turtlebot
but if you want to use those packages, they need to be in the ROS_PACKAGE_PATH. Just remove
/home/sai/fuerte_workspace/help
from your /home/sai/fuerte_workspace/.rosinstall file