Need to speed things up on my home network

I have two PCs (four if you count the two laptops) connected to a D-Link router. Connected to one of the ethernet ports on that router, I have a Linksys NSLU2 Network Storage Link (aka "Slug" ). Connected to the Slug, I have an external IDE hard drive enclosure that contains a nice 250GB Seagate 3.5" internal HD.

I use this networked hard drive for backup for both my computer and my wife's. I also use it as a shared drive, so we can have common access to documents that we both use a lot.

The setup has been rock solid and reliable for the past few years, but it's slow as beans when transferring large files up to the networked drive. It's SO bad that I'm almost starting to think that it's a USB 1.0 enclosure. Hard to say what it is, since it doesn't have a single freaking sticker on the thing. I got it from CompUSA, and it looks like this:


(Sorry for the horrible pic. My camera is having a mid-life crisis)

Anyway, I'm trying to figure out if there's a speedier solution to a shared drive. While I love the Slug, I'm thinking that it would be better to get a drive that's 100% ethernet, assuming such a thing exists. Or, since the Slug has two USB 2.0 ports on the back, maybe it's possible to do two parallel cables somehow. Or maybe someone can look at my old HDD enclosure and say, "Hey, that's USB 1.0, stupid!"

I'm just tired of waiting 3 minutes for each MP3 to copy up to it.