  Let $X$ be any rational ruled symplectic four-manifold. Given a symplectic
embedding $\iota:B_{c}\into X$ of the standard ball of capacity $c$ into $X$,
consider the corresponding symplectic blow-up $\tX_{\iota}$. In this paper, we
study the homotopy type of the symplectomorphism group $\Symp(\tX_{\iota})$,
simplifying and extending the results of math.SG/0207096. This allows us to
compute the rational homotopy groups of the space $\IEmb(B_{c},X)$ of
unparametrized symplectic embeddings of $B_{c}$ into $X$. We also show that the
embedding space of one ball in $CP^2$, and the embedding space of two disjoint
balls in $CP^2$, if non empty, are always homotopy equivalent to the
corresponding spaces of ordered configurations. Our method relies on the theory
of pseudo-holomorphic curves in 4-manifolds, on the theory of Gromov
invariants, and on the inflation technique of Lalonde-McDuff.
