Contrary to what some people might have thought, the CodeWalrus Minecraft server, located at http://mc.codewalr.us , is still in operation. It just has terrible uptime.
The only catch is that now that Juju has moved, if the server goes offline then it is only re-opened on-demand, meaning that you have to bug @Juju
about it. Also, it requires a Minecraft version from the early 70's and it's world-edit-based creative rather than survival, but our affiliate BosaikNet (http://www.bosaik.net/viewtopic.php?f=52&t=132) runs a survival server for those who prefers that.
I do prefer Bosaiknet, thank you :P No offense, I have not tried Codewalrus MC since I seldom play MC, but BN is great besides the server-is-totally-dead-y part.
Yeah it seems that Bosaik had similar lenghts of downtime >.<. I need to check them out at one point, although I tend to be more into creative than survival overall (I don't have the patience to get involved into survival anymore)