What are some tricks to make the lower-tier classes shine?
For example: How do you make a Rogue useful when the wizard can just cast "Find Traps", "Detect Secret Doors", "Knock", "Invisibility", and lots of other spells that do what Rogue does better than Rogue can.
I'm interested in both actual experience (Things that did/didn't work) and theorycrafed solutions (Things that should/shouldn't work) which promote/reward use of the weaker classes.