You're probably already aware of this but since I can't find mention of it on the forums I'd be remiss not to report on my findings.
Like many I could keep clicking on the log-in button for ever and get nothing but fails but I noticed that if I exited and restarted the client I could generally get on in a couple of tries. Perhaps something needs resetting in the client after a failed log-in attempt?
Anyhoo, that's all I wanted to mention except that you introduced me to my next addiction and then mercilessly took it away.
*in my best Apple Bloom voice* I don't wanna play eventually, I wanna play right now! ono
The issue that was preventing players from logging into the game was fixed on Sunday.