updated 2011.09.16pst1607 (10% complete 1st draft)
A serious problem of default WordPress is that it alters the HTML given it
including inserting p-tags and br-tags (such as when there is a blank line in source HTML) and often removing the class- & id-attributes.
The HTML templates used on this site, such as the one this paragraph is in, depend on HTML to be unalterted & interpreted normally, including class- and id-attributes to remain, plus additional whitespace and blank-lines in source to be ignored.
I was recommended Text Control at WordCamp LA DevDay.