Re: How many block groups am I limited to?

Within your theme, you can have as many or as few block groups defined as
you would like.  The block groups are just groupings of blocks.  Each block
can be assigned to one block group. An example of a block group call in a
module is:

<xar:blockgroup name="header" id="header" />

This signifies that this block group will be called at this specific
instance in the template.  In this case the header block group is called.