  After a quick look at the present status of experiments we shortly review in
a first step the ongoing discussions on some of the basic theoretical
approaches to pentaquarks: Chiral solitons, Large-$N_c$ considerations, quark
models, and lattice gauge approaches. In a second step we apply the chiral
quark-soliton approach including linear $m_s$-corrections to the calculation of
magnetic moments of the baryons of the anti-decuplet. In this approach the
parameters are fixed solely by experimental data for the magnetic moments of
the baryon octet and for the masses of the octet, decuplet and of $\Theta^{+}$.
The magnetic moment of $\Theta^{+}$ depends rather strongly on the pion-nucleon
sigma term and reads $-1.19 {\rm n.m.}$ to $-0.33 {\rm n.m.}$ for $\Sigma_{\pi
N} = 45$ and 75 MeV respectively. As a byproduct the strange magnetic moment of
the nucleon is obtained with a value of $\mu^{(s)}_N =+0.39$ n.m.
