Creature collection I (or 3.0) is a collection of the first set of Scarred Lands related creatures to use the new d20 rules. The most familiar of these monsters (the humaniods at any rate) are the Assatthi, the Slithern (or Ratmen), and of course the Carnival of Shadow. Along side them are various new interpretations of things like dragons (Tar dragons, wrack dragons), gorgons (high and low instead of medusa and "gorgon"), oozes (undead oozes by far most popular), and various constructs. That along side new hags, (which became templates in the Revised version for 3.5), the Unhallowed, the Fatlings, and various demonic/infernal things (Ferals rock man), make for what I consider one of the start of the best collection and well know d20 campaign settings to come out at the start of 3rd edition.
Oh yeah I'm the Sage of the Scarred Lands, Nightfall, doing this write up. So there.