Apparently somebody involved in the registration of the "lnk.nu" domain has got something out of whack. The domain currently points to a "Domain Available!" web page, while my registrar (namecheap.com) correctly reports an expiration date of 11/19/2006 (next year). I've sent a support request to namecheap and we'll see how effective their support system is.
Meanwhile, lnk.nu is offline but the minilink service can still be reached through the minilink.org name (although this is somewhat inconvenient). My apologies for the interruption in service. I'll try to get it restored as soon as possible.