Um, "three lengths for vowels and consonants"? AFAIK the only three-length vowel in Estonian is 'o', the rest are just short or long. And as in Finnish, clusters like "kk" or "tt" indicate a glottal stop before the consonant, not a 'long consonant' (except for ss, mm, nn, ll). Jpatokal 21:46, 1 Nov 2004 (EST)
Actually there are 3 vowel lengths. For example:
short: sada 'hundred'
long: saada 'send'
overlong: saada 'to get' (written the same but pronounced longer)
When you're studying Estonian, a common way to see the overlong sound denoted is by writing a tick mark in front of the syllable. But that's not part of actual written Estonian. As for long consonants, yes I mean glottal stop. It's a phrasebook, not a language course ;) I should also say I'm at a very beginning level with Estonian, so if I'm dead wrong with anything, it's entirely possible! -nick 22:11, 1 Nov 2004 (EST)