Speaking of
http://www.tinymce.com/wiki.php/Configuration:valid_elements and
Perl Monks Approved HTML tags
valid_elements : "a[href|name|target|class|title|rel],abbr[title],b,bi
+g,blockquote[class|cite|lang|dir],br,c,caption[class],center,code,col
+[align|col|span|width|class],colgroup[align|col|span|width|class],dd,
+del[class|datetime|cite],div[class],dl,dt,em,font[size|color|class],h
+[class|align],h3[class|align],h4[class|align],h5[class|align],h6[clas
+s|align],hr,i,ins[class|datetime|cite],li[value],ol[type|start],p[ali
+gn|class],pre[class],readmore3[title],small,span[class|title],spoiler
+4,strike,strong,sub,sup,table[width|cellpadding|cellspacing|border|bg
+color|class],tbody[width|align|valign|colspan|rowspan|bgcolor|height|
+class],td[width|align|valign|colspan|rowspan|bgcolor|height|class],tf
+oot[width|align|valign|colspan|rowspan|bgcolor|height|class],th[width
+|align|valign|colspan|rowspan|bgcolor|height|class],thead[width|align
+|valign|colspan|rowspan|bgcolor|height|class],tr[width|align|valign|c
+olspan|bgcolor|height|class],tt[class],u,ul[type],wbr"