I work for Eldis (based at the Institute of Development Studies, UK) and I would like to highlight our free Manuals and Toolkits resource: http://www.eldis.org/go/topics/resource-guides/manuals-and-toolkits
This resource contains downloadable publications on a number of areas which will be of interest to you: advocacy and working with the media, communications, managing NGOs (including fundraising, working with donors), M&E, project management, training.
We also run a small Community group with an interest in sharing good practice and exchanging information on manuals and toolkits in their area of interest: join us here: http://community.eldis.org/eldismanuals.
I hope to meet some of you there. Please get in touch with any queries: firstname.lastname@example.org