Windows: We recommend using HexChat. They also provide an easy guide on how to get started using IRC.
Mac: We recommend using Textual. This costs $4.99, but is open source if you want to build it for free. Alternatively, there is Colloquy.
Linux: We recommend using HexChat or Irssi. They also provide an easy guide on how to get started using IRC.
iPhone/iPod: We recommend using Mango Lite or Colloquy.
iPad: We recommend using Mango Lite or Colloquy.
Android: We recommend using AndChat or AndroIRC.
Server: irc.synirc.net
Port: 6660 – 6669 (6697/7001 SSL)
Channel: #diamondmine