this is my one fave from the list:
28.kaakkaikkum than kunju pon kunju
33.poonaikku maNi kattuvathu yaaru
I like this one too but know it in english as "but who bells the cat?"

I like saying the following ones:

kazhuthaikku theriyuma karpoora vaasanai?

Minnuvathellam ponnu alla.

Kattrathu Kai Alavu, Kallaathathu Ulagalavu

Yaanaikkum Adi Sarukkum

Maamiyaar udaithaal mann kudam. Marumagal udaithaal pon kudam (this was one i read in wiki)

Although there are some proverbs I don't like:

Thottil pazhakam sudukaadu mattum

Ainthil Valayaathathu Aimbathil Valayaathu
...i don't think that's true at all!

the one parents use alot is:

vidiya vidiya ramar kathai vidintha ramar seethaiku enna murai :P

Is there one that means "you can lead a horse to water, but you can't make it drink?" I would like to know that one.