The best way to interact with the worldwide Spellfire community is to join the official Spellfire Mailing List. In addition to random and not so random wackiness, all the latest Spellfire happenings are discussed on this list (card errata, bluelines, rules, tournaments).
Joining the list is easy. Just send an e-mail to LISTSERV@ORACLE.WIZARDS.COM with the words "SUBSCRIBE SPELLFIRE-L" in the body of the message.
You can also subscribe using a web-based form HERE.
The Mailing List Archives can be viewed HERE.
See you there!