User Feedback :: John's "cheap little mini"
This one has two ethernet ports.
I think you could make it slightly larger to fit a harddrive its housing internal power supplies that keeps pc's looking like suitcases. Personally if I were to build it I'd still use a flashcard for the OS and use external USB 2.0 harddrive for extra storage, can even add a cd/rw that way if you want but will just need one of the bigger power adapters listed.
msuho,
To boot with no monitor you may need something like this. Sorry, can't help much with the keyboard though.
AwPhuc,
Robocoastie already linked the TC epia board. Also check out http://www.mini-itx.com/ for a whole host of doowhackeys for epias, including notebook hdd and adaptors to run them.
The buttons could be found for a few dollars on the net, try searching for 'atx push button power switch' in google. The mesh is called 'rain gutter screen,' you can find it at a hardware store. The board has the foam pad under it and is being held by the plastic rivets sold in those motherboard screw kits.
You can see them in this pic:
http://hovyo.com/ebay/cab-gres/cab_3.gif
The total of the case components was under $15, and could be done for even less.
thanks for the info John.
msuho, if you mean the Morex Cubid 3688, thats the case I've got. I have used normal sized RAM. If you want to see some photos search the forum with my login name and find my webserver posts. 
Don't know about having no keyboard connected. But not having a monitor shouldn't be a problem. As long as you set the machine to go straight into a terminal (ie not go to the desktop) it should be alright. I'll admit im still a bit of a noob so I may be wrong 
Eventually....., I may get round to trying this lcdproc.org. It would be soo cool to have an LCD terminal on the DSL box. I've got a large LCD display panel, and found someones code to run the display the linux terminal in that! LCD virtual console 
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