I don't think Bugzita will object to my sharing a resource that may or not be useful for poets, but is reassuring to writers of other stripes and to readers (and aren't we the most important, rally?)
http://www.apostropheabuse.com/
I have posted about a related site on my Grace Paley blog,
I Dreamed I Saw Grace P. Last Night.
http://neverdied.blogspot.com/
Please visit and comment without apostrophe anxiety.