  The NA49 collaboration has taken data of central Pb-Pb collisions at beam
energies from 20 to 158 GeV per nucleon. The large acceptance of the detector
allows to study particle yields in full phase space. In this paper we present
recent results on strangeness production (K, $\Lambda$ and $\phi$) in this
energy range and compare to measurements at lower and higher energies. The
K$^+/\pi^+$ and $\Lambda/\pi$ ratio shows a pronounced maximum around 30
A$\cdot$GeV, whereas the K$^-/\pi^-$ and $\bar{\Lambda}/\pi$ ratio exhibits a
continuous rise. The $\phi/\pi$ ratio also increases monotonically with beam
energy. First results on multi-strange hyperon production at lower SPS energies
are presented.
