• Bench Top Table Saw - This is basically a portable saw.  These are nice because you can move them the location your are working and set them on top of a bench.  The downside is the tend to lack power.  They will have the same amps or RPM, but the drive configuration is different. 
• Contractor Table Saw -These are heavier, but usually have wheels mounted to the bottom of the legs.  The motor hinges off the rear of the saw and drives the blade.
• Cabinet Table Saw - These are very heavy, but once they are set up they stay there.  The cabinet table saw has a closed base, hence cabinet.  These typically require more power and need a 220V outlet.  They are the most expensive, but probably will no bog down under condition that would make a portable bog down or even stop.  Since these are heavier the often vibrate a lot less and the durability is increased.

Drive Configuration

• Direct Drive Motors - These are linked directly to the blade and transfer all of the power to the blade.  Personally with my experience and what I have heard these motor tend to wear out quickly compared to the Belt Drive Motors.  I have a portable table saw and it has direct drive motor and it still runs fine after six years.
• Belt Drive Motors - These have a belt that transfer power to the motor.  The motor is set away from the blade which reduces the chances of over heating from saw dust and in return causes the motor to last longer. 

Table Saw Accessories

• Extension Table - Extension tables mount to the side of the table saw and basically increases your table size.  This helps you maintain more control when cutting wider pieces of wood.
• Dado Heads - A dado makes a wider cut which is good for shelving and other applications.  Most table saws have a Dado plate and accept the blades, but be careful as some models will not let you use a Dado blade
• Rip Fence - A rip fence is a single fence on top of the table that the user adjusts to help create a desired length or width cut.  Helps make sure the cut is straight.
• Miter Gauge - The table has two grooves running the length of the table.  The gauge sits in the groove and helps guide the user to create an angle cut.
• Crosscut Sled - This is used to hold the work piece at a 90 degree angle to the blade. 
• Tenon Jig - A jig that holds the work piece vertically so cuts can be made across the end.

Safety

• Read Instruction
• Make sure the saw is unplugged any time you change the blade
• Use a push stick and save your fingers
• Always use the blade guard
• Wear eye protection
• Wear ear protection