As everyone knows, Solos and Elites get locked down and abused waaay too easily. Here are simple "templates" to boost Solos and Elites that are easy to remember.
-Elites-Immune stun, dominate
-Solos-Immune stun, dominate; save at beginning and end of turn
-Give them both a multi-attack if they don't have one.
-Add an aura or effect that does automatic damage if the creature doesn't already have one. about 10 damage at the end of heroic, 15ish by the end of paragon, and 20+ at epic depending on your party.
These things are easy to remember and they work. You have probably started doing some of these things already.