From their website:
"ZooKeys is a peer-reviewed, open-access, rapidly produced journal launched to support free exchange of ideas and information in systematic zoology.
All papers published in ZooKeys can be freely copied, downloaded, printed and distributed at no charge for the reader. Authors may retain all other rights on their works. Authors are thus encouraged to post the pdf files of published papers on their homepages or elsewhere to expedite distribution.
Papers are published both online and in the traditional printed format, in full compliance with the current requirements of ICZN."
The abstract from the editorial opening paper:
"Publishing taxonomic and systematics studies in the digital era faces major challenges and requires new approaches, many of which are currently stimulating spirited discussions amongst taxonomists and systematists. New amendments to the International Code of Zoological Nomenclature are expected to regulate electronic publishing of new taxa and create a standard form for their registration (ZooBank). Responding to a perceived need, this editorial announces establishment of ZooKeys – a new online and print journal in zoological taxonomy and systematics, which aims to quickly respond and adapt to the newest developments in taxonomic publishing. Open Access is accepted as mandatory for ZooKeys. Th e rationale for and concept of ZooKeys is discussed in detail."Check it out here.