I had a long reply typed out, but my F*@(&#! tablet died, so here's the short(er) version.
@JoeDuck: Thank you, I managed to snag a bundle on the first day. Since you know the Groupees people though, you may want to pass on that the countdown to release timer is a very bad idea.
Nobody else running an indie bundle uses countdown to release timers anymore for that exact reason, they know better to spread out traffic or demand, especially since this is one of the better bundles to come around, or risk (with high probability...) crashing their site.
As previously mentioned, this will likely not deter anyone from buying the bundle, but may reduce the amount of money people are willing to contribute...thus the perceived success of this bundle.
My recommendation, just launch the bundle quietly and let it spread by word of mouth and not necessarily officially via twitter.
They were already planning on running the promo for two weeks anyway. If they get their act together, by the time the next bundle comes around, provided they've learned their mistakes, no one would even reasonably hold these snafus against them.