Usually you have a strip update every Sunday (Saturday in the US), but apparently, you don't this week, as Thursday's strip is still up on the main page.
I take it that you're having troubles with Keenspace this week -- another comic that I read that uses Keenspace (as reported here) is also having troubles uploading new material to Keenspace's servers.
With Keenspace having a few difficulties the past few months, I wonder why many still use it at all.
Just as chagrinning is that this is the first time since "School Spirit" began that you missed an update.
Hopefully, the new stuff will be up soon.