The following are some excellent articles concerning learning theories:
Indiana University in this
Time period index
article, provides and excellent history and development of learning style theorists from Plato to Gardner, who have speculated on: the nature of intelligence, the way we measure intelligence, and therefore influence teaching and learning.
Two interesrting articles are provided by the Funderstanding web site. The 1st article reveals 12 theories on how people learn.
The 2nd article from Funderstanding loks at ten different theories on how to design instruction 10 theories on how to design instruction .
The Univeristy of Colorado also provides an excellent assortment of Theoretical sources on learning.