What are circuit shields?
If u dont know what im talking about :-
http://www.picaxe.com/Circuit-Creator/Shields/
Shields
Shields are modules that expand the capabilities of your board. They are typically shaped the same as your uC board and share the same pinout. They plug right in, in a “stacked” configuration. These shields are more typical for an Arduino.
There are no shields available for your 28x board.
Thanx a lot. :)But can you
Thanx a lot. 
But can you explian that a little more?
Wat does one mean by Expand the capabilities? Like just some more output/input pins; or are there other properties ?
There are many different
There are many different options already available, with more turning up as new shields are designed.
A few examples are:
• shields with breadboard/prototyping space (for adding your own parts)
• TV shield for generating video output to a TV
• Motor driver shields for controlling DC motors, stepper motors, servos etc
• Real time clock shield
• LED shield
• input/output expander shields
cool. Thanx
cool. Thanx