According to an ICANN announcement published yesterday, all UDRP providers must accept electonic filings by UDRP claimants and respondents as of March 1st, 2010. The original rules had required UDRP providers such as WIPO to provide hard copies of the entire complaint. As of March 1st they will only be required to forward a hard copy notice that a UDRP complaint has been filed.

ICANN | Announcement Regarding Implementation of Modification to Implementation Rules for Uniform Domain Name Dispute Resolution Policy.