Authorize.Net says its service was used in an attempt to charge money to stolen credit and debit cards.
http://news.com.com/Payment+processor+fears+credit+card+crooks/2100-7349_3-6057305.html?part=rss&tag=6057305&subj=news
http://news.com.com/Payment+processor+fears+credit+card+crooks/2100-7349_3-6057305.html?part=rss&tag=6057305&subj=news