Salesforce.coms big enterprise customer that will be announced Tuesday is apparently Merrill Lynch. BusinessWeek reports in its latest issue (subscription required) that Salesforce.com CEO Marc Benioff is looking to take on Bloomberg. For the non-Wall Street types Bloomberg provides a box much like a PC that pumps financial information and real-time tools into bond and stock trading houses. On Wall Street Bloomberg terminals are everywhere. (And they are a bit addictive if you are a financial nerd.) Benioffs play, which was teased during Salesforce.coms earnings call, is to try to undercut Bloomberg, which charges $1,500 a month. BusinessWeek reports: Benioff...