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Jeff has been editing again using the IP addresses http://en.wikipedia.org/Special:Contributions/166.70.238.45 and http://en.wikipedia.org/Special:Contributions/166.70.238.44 (and possibly others) He appears to have the netblock: 166.70.238.40/29. This is a violation of his 1-year ban from July 2007.
A traceroute to these IP addresses ends with:
19 jmerkey.fttp.xmission.com (166.70.235.16) 3035.655 ms !H 3028.875 ms !H *