According to the letters, South American Domains lost accreditation for failing to provide “an interactive webpage and a port 43 Whois service providing free public query-based access to up-to-date (i.e., updated at least daily) data concerning all active Registered Names sponsored by Registrar for each TLD in which it is accredited.”
Simply Named and Tahoe Domains both lost accreditation for failing to escrow registration data with ICANN and failing to pay accreditation fees according to the Registrar Accreditation Agreement.
According to Michele Neylon at CircleID.com, each of the registrars had less than 300 gTLD domains.
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DomainConvergence | August 12-13, 2009 | Toronto, ON, Canada
Keynote speakers: The Castello Brothers on "Branding your Domain"
Christian Heilmann, Developer Evangelist, Yahoo!