Hi, I'm not Lori H (nor do I play her on TV!) but I am an OT trained in sensory integration. Here are some websites/books that are helpful in understanding SI issues:

http://www.sinetwork.org/

http://www.sensory-processing-disorder.com/

Books: Sensory Integration and the Child by A. Jean Ayres (I highly recommend this one)
The Out of Sync Child (and other titles) by Carol Stock Kranowitz


And for dyspraxia:

http://www.dyspraxiafoundation.org.uk/

Great website with descriptions of behaviors/performance issues noted at different ages. Dyspraxia is one type of sensory processing disorder.

Hope this helps.