When you cast a spell from the wand, you're the caster. That Wizard with a wand of Bull's Strength? Yeah, he can cast it into his Weave. Fifty times, before he needs a new wand.
Also - this is a tangent, but the Sorcerer has a different wording in the spellcasting entry than any other class; exactly as the text is written, the Sorcerer is not limited to the Sor/Wiz spell list.
Dual-wield Effect spells that make them touch attacks. One of my favorites for this is the Druid's Produce Flame. Seven touch attacks/round, at range, at 20th. Plus one, if you're Hasted by either boots or a friendly caster. Pure Core, too. Tends to one-round most things, provided you cast the two Produce Flame spells before the battle starts (and the duration is enough that you can usually get away with that).
Drastically reduced Long-term power, too - depending on whether or not your DM buys the "text trumps table" that's at the front of the errata. The table for the Rainbow Servant says it loses four caster levels. The text for the Rainbow Servants Spells Known/Spells per day says you get an increase in spells known and spells per day at "every" level.