If you're starting from scratch, you may consider www.mendeley.com (does still have problems importing pdf's linked into Endnote - as of 2010-11-26)
Regards Martin Dr. Martin K. Obrist ^v^ ^v^ Swiss Federal Research Institute WSL Biodiversity and Conservation Biology CH-8903 Birmensdorf, Switzerland MG D 52 phone: ++41 44 739 24 66 fax: ++41 44 739 22 15 E- mailto:martin.obr...@wsl.ch WWW http://www.wsl.ch/fe/biodiversitaet/