  We prove two results from Morita theory of stable model categories. Both can
be regarded as topological versions of recent algebraic theorems. One is on
recollements of triangulated categories, which have been studied in the
algebraic case by J{\o}rgensen. We give a criterion which answers the following
question: When is there a recollement for the derived category of a given
symmetric ring spectrum in terms of two other symmetric ring spectra? The other
result is on well generated triangulated categories in the sense of Neeman.
Porta characterizes the algebraic well generated categories as localizations of
derived categories of DG categories. We prove a topological analogon: a
topological triangulated category is well generated if and only if it is
triangulated equivalent to a localization of the derived category of a
symmetric ring spectrum with several objects. Here `topological' means
triangulated equivalent to the homotopy category of a spectral model category.
Moreover, we show that every well generated spectral model category is Quillen
equivalent to a Bousfield localization of a category of modules via a single
Quillen functor.
