Useful stuff related to the ONE simulator and DTNs in general:

• Opportunistic Mobile Networks: Advances and Applications
• The DTN Blog by Barun Saha
• Performance metrics used in the ONE simulator
• Matthew Orlinski's blog
• Survey of DTN protocols
• SOMaLi – Searching ONE Mailing List by Juliano Fischer Naves

Mailing lists:

• The ONE simulator mailing list
• Dtn-interest mailing list (DTNRG)