Small business that need effective task assignment without the hassle of big project management applications have a few options and tools like spreadsheets available - but here is a new option:

TaskDriver is a unique task assignment based application developed specifically to meet today’s tough corporate standards of task assignment and tracking. It is a browser based thin client built with PHP/MySQL technologies. It contains built-in authentication, Manager/Assignee relationship and easy deadline tracking.

Features–
* Manager / Assignee relationship
* Quick and easy task creation and assignment
* Email notifications on task statuses
* Individual task history captured and reported
* Easy install and setup. (Requires PHP/MySQL)

Related Book: Getting Things Done: The Art of Stress-Free Productivity