I know this is something many of you have had to deal with for a long time... but for future reference, be careful what you type while at work:
http://www.azcentral.com/business/articles/0719workemail19.html
“The poll said 25 percent of companies fired a worker for violating e-mail policies, up from 2 percent last year....
“About 0.5 percent of companies said instant messages have been subpoenaed.”