Have you checked it recently ?
I have just visited the home page (using firefox 8.0) and no alert by avast!.
If you get an alert could you post the full path (with the http changed to hXXp) or post a screenshot of the alert window. Unless this is an IE exploit as Pondus’s reply tends to suggest.
Yes, no alerts, but the Reputation one is considered suspicious, no doubt that is from WOT, which doesn’t like the site based on zero reports just votes.