Possibilities and way to design and implement a ZigBee-based data transmission and monitoring wireless smart sensor network integrated with the Internet are considered and described in the paper. Implementing of a cost-effective such system requires the use and integration of different hardware elements and programming languages. Possibilities and key aspects of smart sensor nodes are considered and described in the paper. Integration of wireless smart sensor network and their sensor nodes with the Internet is described in more details. Design and implementation of an inexpensive energy saving ZigBee point-to-point wireless smart sensor network to monitor sensor data in energy efficient manner using XBee modules and different boards are proposed and described. Configuration of used XBee modules for smart sensor nodes communication is also described. Practical implementation of a battery powered smart sensor nodes and coordinator node is described in details. Data measurement with such sensor nodes is also described. Results of wireless data measurement, data transfer and monitoring with such ZigBee based wireless smart sensor network via Web technologies are shown in the paper.