Front Cover: Poly(diindenonaphthalene) PDIN, a novel “low bandgap”, conjugated polymer shows an intense absorption band in the VIS region peaking at ca. 724 nm (Eg: ca. 1.45 eV). PDIN and related cross-conjugated polymers are promising candidates as the donor component of bulk heterojunction-type organic solar cells. Further details can be found in the article by E. Preis and U. Scherf* on page 1105.