If you use KDE, you could create a shortcut containing the command and click after the mount happens.  On Kubuntu, I've had USB pen drives auto mount.  Also, have you looked into any of the sync apps like ksync?

From: Kyle Sexton
Sent: Tuesday, July 25, 2006 3:05 PM
To: kclug
Subject: "autorun" type functionality from automounter

I was wondering if anyone had a way to automatically run a command after automounter sees a new device and mounts it.  My goal is to automatically sync over new podcasts to an mp3 player when it's mounted.  I've searched around and haven't seen a simple way to do this.  I'm trying to avoid writing a poller in a cronjob that looks for the device. :)

Thanks,
Kyle