Re: Has a new kingdom of living things has been developed,or still 5 kingdoms?

There has been a proposal, not yet totally accepted, to divide the Kingdom 
Bacteria (or Monera) into two or more kingdoms.   The most common division 
is into the Archaebacteria and the Eubacteria, which are often treated as 
subkingdoms under the five kingdom system.  A more extreme proposal is to 
further divide the Archaebacteria into three kingdoms.

References:

Margulis, L., K. V. Schwartz, and M. Dolan. 1999.  Diversity of Life: The 
Illustrated Guide to the Five Kingdoms.  2nd ed. Jones and Bartlett, 
Sudbury, Mass. 248 p.

The Archaebacteria at 
http://www.scibridge.sdsu.edu/coursemats/introsci/diversity/archaebacteria.html 


Also try other web pages on Archaebacteria and/or Eubacteria.