D&D Published World foums at The Piazza (Dark Sun, Mystara, Spelljammer, Planescape, and more); Core Coliseum; D&D Material including my Master/Expert DM Competition entries
The essentials material introduced schools instead of implements. Do you think new schools of magic would be usable by someone without the essentials? I noticed Defenders of Midgard. I'm very interested in the Clockwork Magic.
The spells should just be spells. Being a Clockwork Mage should give you some kind of bonus when using those spells, but I don't see why a PHB1 Wizard wouldn't be able to use the spells at their baseline effects.