We evaluated other file sharing SaaS's below. Here are the summary notes.

Syncplicity is a desktop sync tool that allows us to automatically sync desktop computers with a Syncplicity account (up to 2GB of storage with the free account). While we can invite collaborators to view and edit shared folders, they must create a separate user account. Online access is limited to account holders. Syncplicity allows you to sync your Google Docs folders with your Syncplicity Account. Syncplicity is a great tool for storing your files in the cloud, however creating a public space for sharing and collaboration of docs with Syncplicity is limited.

Ease of use for sharing files with like-minded organizations: Low

Drop Box: Drop Box provides File Sync (including for iPhone), File Sharing and Online Backup. Drop Box sync files in any location, so if you edit a document in one location, it will update the document on every other device (like Google Docs). File Sharing is limited, as users must be invited to view your dropbox. Links can be sent to specific files within Dropbox. Dropbox includes automatic sync. You cannot edit documents and photos online (must download and reupload to edit). Cannot embed on external sites.

Ease of use for sharing files with like-minded organizations: Medium

Foldershare links two computers that are already online, so you can share files between them. In order for Foldershare to work, both computers have to be online. Foldershare is best for accessing your files on mulitple computers at the same time.

Ease of use for sharing files with like-minded organizations: Low

Drop.io: Offers 100MB storage space for free. Allows files to be shared privately without accounts, personal registration or email addresses. The site is not searchable or networked, people must know the URL to the drop in order to view the files. Meant mostly for media fies (photos, video, audio).

Ease of use for sharing files with like-minded organizations: Medium

Microsoft Sharepoint: Is an enterprise solution for file sharing and collaboration. Provides access and revision control. Sharepoint is a desktop software tool that must be installed on a local Windows server.  It is an online storage space for documents and provides collaboration functionality. Sharepoint includes wiki-build options and an online editor and can run internally or from within existing websites. Create password-protected site to share documents with like-minded organizations. Updates on documents are not in real-time, but must be re-synced with the original document. Sharepoint is best used for building large scale intranet projects.