JDBC Binary transfer of Arrays

Hello!
In my current application I am sending a lot of data to/from the DB with
JDBC, and specifically arrays of Double. (or even Double[][]).
Alas, my current implementation I converts everything into a string
representation, which blows my memory out of the water and drops my
transaction rate way way down while I spend most of my time working with a
StringBuffer.

I note that there is this web page:
http://wiki.postgresql.org/wiki/JDBC-BinaryTransfer

Which makes me think I might be saved. Has anyone used Binary Transfer for
Double[] (or other) array data?
Any pointers to some implementation would be great...
Right now I have my own implementation that extends java.sql.Array, and
contains the string and a typeName and num.

Regards,
-JD