Not exactly what you want, but...
The D+D faq at
http://www.wizards.com/dnd/article.asp?x=dnd/er/er20021018a
on page 14 (bottom of right column)has a section on the differences
between knowledge, profession, and craft (which corresponds to T20's
technical skill).
After reading that, I'd put the T20 skills like this:
E/Dance: Covers formal dancing (ex: ballroom), informal dancing (ex:
Disco), and performance dancing (ex: ballet, Interpretive Dance).
This is the skill used to actually perform the action of dancing
(whatever kind it may be) and should probably be modified by dex or
cha.
K/Dance: Covers knowledge of particluar dance techniques (ex: 17th
century formal dance), their origins, customs, and peculiarities, but
not the actual action of dancing. A good use for this skill would be
recognizing a particular dance step.
T/Dance: non-existant
P/Dance: non-existant, though there might be P/Choreographer
If you play d20 of any sort, it helps to have at least a passing
familiarity with the above faq document (though you can ignore the
inapplicable sections, like magic).
(I'm cross-posting this to the T20 Yahoo! group)
Hope this all helps answer your question!
-Justin