So, in the general spirit, and playing around:
Wand: +1 to hit (equiv: broadsword -> bastard sword)
Staff: +1 AC, inflicts +d8/tier on a critical
Rod: Can reroll each damage die once, but must keep the new value.
Orb: +1 damage, +1 to ongoing damage inflicted with spells.
Totem: Summons, Spirit, and Wild Shape inflict +1 damage per die (could be different types of superior totems)
Summoning Tome: Summoned creatures and conjurations gain brutal(2).
General Tome: +1 damage if you wield this tome with both hands. Double the range on ranged spells cast through this implement.
Holy Symbol: (has to vary, but) inflicts vunlerable(Radient) 1/tier on a hit.
Superior Implement Weapon: Implements powers used through this weapon inflict 1[W] per 2d6, 2d4, or 1d8, or 1d10 of power damage. Retain any damage that cannot be converted. Brutal, High Crit, and Versitile applies to converted weapon damage when used as an implement, but not other spell damage.