A SmartZone system is a network of multiple sites, which operate under the control of a master controller.
A Hybrid system is one which uses both Type I and Type II trunking.
Splinter freqs are to be used if you live in a border region, such as San Diego, where freqs are negatively offset by 0.0125. 856.0000, 856.0250, 856.0500, 856.0750, etc. Nothing ending in five basically. This applies to 851-866 only.
Also, try taking a look at the Wiki area for more information on Motorola trunking. The system types are detailed there.
-Wayne