I just updated the post with new information.
A new client is now available from
ClassiCube.net, and I would highly recommend using it instead of WoM. It's an open-source client jointly developed by Jonty800, AndrewPH, and me (with some help from others). It can do everything that WoM can, and then some. Among other things it supports anti-aliasing / anisotropic filtering, easy-to-install texture packs, chat logging, screenshot taking, map file saving, etc etc etc. It's being actively developed.
Charged-Miners had been deprecated. The only way to play with Charged-Miners at the moment is direct-connect. Its server-list-loading and server-information-fetching code broke a while ago. I'll update the post if an update is ever released.