Dimdim - Online meeting/webinar application.
Drop IO - Provides free web-based fax sending and receiving (also provides document and voice file sharing services).
Google for Nonprofits - Provides charities access and guidance on how to use a variety of tools and resources that Google offers. Google Apps, provides a free way to host email and provide organization-wide calendar and document sharing.
Microsoft Live Office - Document sharing site that is useful for sharing collections of documents with groups of people using a password.
My Committee - Handles committee member contact information, agendas, minutes and other committee documents for a nominal fee.
Slideshare - share PowerPoint slides and presentation.
The Knight News Release Workshop - Provides step-by-step help for writing news releases.
Tinyurl - Provides short URLs to replace long ones.