Metal cluster complexes with interesting magnetic properties characteristic of nanoscale magnetic particles have become an attractive prospect in the last few years. These complexes exhibit magnetization hysteresis loops and out-of-phase ac magnetic susceptibility signals. The advantages of such clusters over fragmented bulk ferromagnets are their easy synthesis and manipulation, their high solubility, and their potential use in storing a large density of information. Here we will focus our attention on the family of several distorted Mn4cubane molecules with a [MnIVMnIII3O3X]6+core, tetranuclear vanadium (III) complexes with a butterfly structure and dodecanuclear manganese complexes, [Mn12O12(O2CR)16(H2O)4] (where R can be an aliphatic or aromatic group) and their corresponding singly reduced salts [Mn12O12(O2CR)16(H2O)4] (PPh4), which have been extensively studied in our laboratories.