I've been playing around with WeakAuras a bit the last little while; in particular with the Frost and Arcane (mostly arcane) specs on my mage. I'd encourage anyone who uses WA to check this out, I'm rather proud of them. :) Just use the New->Import feature in WeakAuras, and copy and paste the strings below to import them into your UI. They're self-contained groups so they won't mess up any pre-existing elements you have set up.
Mage UI Basic Configuration Arcane/Frost (Autodetects)
Nether Tempest Tracker - Arcane (auto-detects Arcane spec)
I've attached an example of what this looks like. :)