From Dynadot:
ICANN Announces a New AGP Limits Policy
ICANN has recently approved an AGP (Add Grace Period) Limits Policy which will limit the number of grace deletions a domain registrar can make without incurring a registration fee. This policy only applies to the global TLDs such as COM, NET, ORG, etc. It will probably have little to no effect on the country TLDs such as WS, CN, US, etc.
We expect this policy will be implemented by the central registries sometime in early 2009. Due to this change, we may have to raise grace deletion fees substantially or remove grace deletions altogether.
More information about this change can be found here:
AGP (Add Grace Period) Limits Policy
http://www.icann.org/en/tlds/agp-policy-17dec08-en.htm