Open Source Database usage rockets up in Businesses

In another Intelligent Enterprise column, BI Driving Interest in Grid mentions a study by Evans Data titled "Database Developer Study" with a few interesting statistics. Leading the story is that 26% of respondents are interested in implementing some sort of Grid computing, probably from either IBM, Oracle, or Sun.

Buried further in the article, it notes 64% of respondents use open source databases in some capacity, up from just 7% three years ago. (of those, 48% use MySQL) Do CIOs realize this? Someone should give them an update.

Is there a magic tipping point when the open source option is assumed viable in the enterprise? When is it?