It's actually kinda hard to always use the "correct" encounter sizes, because they are not really nailed that strongly down. There is a level range and several encounter templates that can be filled for the different levels, but you can exchange monsters against elites, solos or minions and all that.Always using the "correct" encounter sizes for a challenge can quickly lead to boredom. I'm a big fan of easier and harder encounters to keep players on their toes and having fun.
Last session the 1st level PCs ran into dozens of 9th level Orc Warrior minions (and ran away). Their next encounter was with 2 1st level brute fire beetles (200 XP, well below standard 500). They seemed to have a great time.
It is hard to feel heroic when you NEVER face a good fight...it is eaithe rrun or a shoe in...
I sincerely hope that the DMG 2 includes more hard crunchy stuff (especially more traps, and guidelines for making your own traps).
Sah-weet.You're in luck, "Designing Traps: Use this guide to create traps for your adventures; you’ll find plenty of examples." It'll be in chapter 2 of DMG2

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.