Amy Guckeen reported in "our" Milwaukee Catholic Herald, April 3, 2008. Heidi Russell, director of Christian formation at St. Monica, Whitefish Bay, blogs at Theological Reflections, posting about once a week. It fits the common perception of blogs as a means of personal expression; while she's a DRE, she doesn't blog in that capacity.
That is not inherent to the medium; one could have a "blogging DRE" blogging as such for a parish, or see a parish weblog for that matter.
Why don't we see that? From my experience, suggesting that blogging software might be a way to post current information on the parish website would be received about like suggesting a parish launch a space station.