Warren Buffett has been buying lots of Iron Mountain stock

It's hard to know if it means anything, but the Wall Street Journal Market Watch blog reported last week that among Warren Buffett's top investments in the first quarter was 794,800 shares of Iron Mountain. When an investor turns his attention to a storage and document management vendor in this fashion, it does make me curious. Whether Buffett sees this as a growing need or just has an interest in this particular company, I can't say, but it definitely could raise some eyebrows in the industry. See the WSJ report.