AOL announced today that they are phasing out non-ARF feedback loops. As of September 2, 2008, no new non-ARF feedback loops will be created and all existing non-ARF feedback loops will be converted to ARF.
What is ARF?
ARF stands for Abuse Reporting Format. It is a standardized format intended to make processing of automated abuse reports (or feedback loop reports) easier. Word to the Wise has published tools to help recipients process ARF formatted reports and help developers create tools to handle ARF formatted reports. Abacus also supports ARF format out of the box.

AOL • arf • Tools