Rails/Ajax/File::Tail?

[x1]

I'm using File::Tail for a few projects and.. would like to
incorporate it into a web based interface. Has anyone done this yet? I
would even settle for a java applet but I cant find one of those :-(

I was able to find an existing php project that did exactly this,
however PHP is not an option
for me.

I've used quite a few of rails' ajax features but never anything that
is consitently updated behind the scenes (non DOM type stuff).

Thanks in advance for any input or direction that can be provided.