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Adding more than one SBS 2003 Domain Controller

I find myself in an uncomfortable position that needs to be resolved asap.

Senario:  Small (50 user) network running One SBS 2003 R2 acting as Domain controller.  No Exchange.  This server currently provides user account authentication and file sharing.  Obviously as is now, if/when this server goes down we have a serious problem on our hands.  

I assume that the best way to handle this would to add another Domain server?  If so, can the most recent Microsoft server (2008?) "plug in" to our aging 2003 R2 domain and act as backup?  Are there any special/complicated things that need to be done to make this work?   Would a matching amount of client access licenses need to be purchased for the new server software?

Please advise, I this one server setup keeps me awake at night!
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zippybungle2003
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Officially you  cannot have an additional domain controller in sbs 2003, unofficaly you can however it cannot hold any FSMO roles so its nigh on useless in a disater situation,

you need to move to sbs 2008 to have an additional domain cotroller in a small business enviroment.

You need to investigate upgrading :)

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=52b7ea63-78af-4a96-811e-284f5c1de13b

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coolkev99

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Thank you all so much for the quick responses.  Looks like I'll be pushing for a new 2008 server.  Adding it looks pretty straightforward, (assuming things go as planned :)  
Everything RobWill posted is accurate, and his answer is already accepted, but I have a concern:

    "This server currently provides user account authentication and file sharing."

Adding a DC *won't* resolve problems related to accessing shared files since they would still be on the "down" server.

If the DC shuts down, workstations should still be allowing logons using cached credentials, so the authentication services being down (temporarily) will also not be an issue.

So my query is, what problem are you trying to solve?  In my mind, adding a DC adds unnecessary complexity to most SBS networks (restores are MUCH more brittle to all but the most experienced AD admins) for very little gain. You'd be better served looking at better options.
cgaliher:

Yes, the file share would still be an issue, and I that did come to mind.  The data is backed up, but I would have to recreate the shares if the server hosting the data went down.   I don't know of a way to remedy this situatiion.  I'm trying to keep costs as low as possible and so a better way handle this scenario is much appeciated.
Honestly, for SBS, again, cached credentials work, and getting HA is a moving target, but here are my current thoughts:

1) A solid server with RAID1 disks for the OS, dual power supplies, dual processors, ECC RAM, plugged into a UPS is damn near bulletproof. Then the problem is software failure/corruption, rarely, if ever, hardware.

2) DAta (Exchange, SQL, fileshares) I move to a dedicated storage device. That has been storage arrays, but Drobo is makign big moves to get into business, so there is some big potential there.

3) Nothing beats a SOLID backup plan. A good backup can recover you from software related failres (see #1) and good hardware prevents hardware failures (see #1) so you don't need a econd DC, or bizarre configurations. You can achieve near 99.9% uptime.