Digital curation: community

Digital Preservation Coalition (in the UK)

Digital Preservation Q&A : where you can ask questions and receive answers from other members of the community. Moderated by the National Digital Stewardship Alliance (NDSA) and Open Planets Foundation (OPF) 

Open Preservation Foundation (international, with a European base)

National Digital Stewardship Alliance (in the USA)

DCC Associates Network (DCC: Digital Curation Centre)

Digital Curation Exchange (USA based)

DIGITAL-PRESERVATION@JISCMAIL Email discussion lists for the UK Education and Research communities

DigiPres Commons Community owned digital preservation resources

Community Owned digital Preservation Tool Registry (COPTR) 

North West Region Digital Preservation Group: A group of Archivists in the North West looking at digital preservation issues.

Blogosphere:

The Signal: Digital Preservation

Practical E-Records

Future Proof

Digital Preservation Matters

DARTBlog: Blogging about digital archives, scholarship & repositories (University of London Computer Centre’s Digital Archives & Repositories Team)

Digital preservation: checksum

A checksum is a count of the number of bits in a transmission unit that is included with the unit so that the receiver can check to see whether the same number of bits arrived. If the counts match, it's assumed that the complete transmission was received. Both TCP and UDP communication layers provide a checksum count and verification as one of their services (Definition by SearchSecurity of network of technology TechTarget).

This blog post and video provide a good introduction to checksums in the context of digital preservation.
See this blog post for some advice on possible  tools.
See concept of significant properties and digital preservation of  InSPECT (Investigating the Significant Properties of Electronic Content Over Time)

File Formats for preservation

Selecting File Formats for Preservation, from the Paradigm Workbook on Digital Private Papers

Obsolescence: File Formats and Software, part of the Digital Preservation Management: Implementing Short-Term Strategies for Long-Term Solutions, online tutorial developed for the Digital Preservation Management workshop, developed and maintained by Cornell University Library, 2003-2006; extended and maintained by ICPSR, 2007-2012; and now extended and maintained by MIT Libraries, 2012-on.

Recommendations on file formats for long term preservation, made by the UK Data Archive

Todd, M (2009). File formats for preservation from the Digital Preservation Coalition Technology Watch Report Series

File profiling tool:

File Format Identification of Community Owned Digital Preservation Tool Registry (COPTR)

DROID (Digital Record Object Identification)  which was developed by The National Archives (UK).