Arstechnica posts a review of the new iMac, and had an overall positive impression.
My biggest areas of concern with the iMac going into this review were the new keyboard and glossy display. Both take some getting used to, but the adjustment period was briefat least for meand after awhile the changes with the keyboard and monitor didn't really register with me.
Meanwhile, Apple has already issued a software update for the new iMacs. Apple released iMac Software Update 1.0 yesterday.
This update provides important bug fixes and is recommended for 20-inch and 24-inch iMac models with 2.0, 2.4, or 2.8GHz processors.
Update: CNet also posts a review of the iMac, and gives it an Editors Choice.
The bottom line: With its super-elegant new design and a strong configuration, Apple's new iMac competes with the PC desktop market better than perhaps any previous Mac to date. Unless you're a gamer or an upgrade enthusiast, we can think of very few reasons not to make an iMac your next desktop.