Looks like Macs are making inroads in corporations, according to this Businessweek article. The iPhone is one of the "Trojan Horses" that is helping get them there.
http://www.businesssweek.com/magazi...29.htm?chan=top+news_top+news+index_top+story
http://www.businesssweek.com/magazi...29.htm?chan=top+news_top+news+index_top+story