I've been looking at it as well over the last few days.
At the very least, it makes qualifying for a few PrCs much simpler, and perhaps with better casting:
Arcane Trickster
Blackflame Zealot
Daggerspell Mage
Shadowbane Stalker
Harper Paragon
Pick your preferred skills
Pick your save
Choose spells off of Druid, Cleric, Wiz/Sorc lists
With just SRD you can easily build a
Spellcaster-10 / Arcane Trickster-10 with 10d6 sneak attack and full casting
If you break the guideline of not using base classes you can get some bigger numbers, but there's already been threads on that.
Ultimately, I'm curious if it can make some of the more unpopular PrCs playable, viable, or even *gasp* optimized.
Spellcaster(Divine) / Blackflame Zealot -> and now you can put Greater Invisibility on your spell list and make Death & Sneak attacks easier.