From the introduction:
Seeds are story ideas, plot ideas, creature
ideas, adventure hooks, anything that can grow into an
enjoyable gaming experience. Each seed is small (only
a paragraph or two at most) and each Seed product
will be small as well (only four to five pages), but
just like their namesakes, they have great potential
when provided with the right environment.
Supers is four and a half
pages packed with adventure ideas suitable for supers gaming.