Death in Freeport (Green Ronin) and
Three Days to Kill (Penumbra) were both released at GenCon on the same day as the PHB. They remain two of the best 3.x modules released.
However,
Crucible of Freya was not released until November or December of 2000 (after the core rulebooks were all published). You may be thinking of the free PDF of "The Wizard's Amulet" which Necromancer released in, IIRC, September.
This is not correct, either. I was at GenCon that year. The Creature Collection had not been released. It beat the MM to market, but it was not released the same day as the PHB.
Justin Alexander
http://www.thealexandrian.net