En réponse à Ray Brown :

>Yep - I was going to suggest cuneiform.  I know of no syllabaries that are
>exclusive vowel first, and I'b be very surprised if any such existed or had
>existed as AFAIK no natlang consists only of blocked syllables beginning
>vowels only.

Well, not a natlang, but in my conlang Azak roots are written with an 
alphabet and suffixes with a syllabary. But since Azak suffixes are always 
in the form VC or VCVC, the syllabary is a VC syllabary (with a few VCVC 
simple signs :)) ).

Christophe Grandsire.

You need a straight mind to invent a twisted conlang.