For spellfire: It sounds like they've changed it in 3e to make it more balanced. However, what about when ou've got a character that uses spellfire as a backup. For example, can't you have a fighter with spellfire, who uses it as his ranged attack? Is there any limit to how long you can store the energy?
Man I wich I had an FRCS so I could talk more about this.
Omegium: The sorceror in my group is far from poorly designed. Him taking Sacrifice spell has freed him from having to take a lot of higher level offenseive spells. He started with magic missile. He then got lightning bolt, then finally sacrifice spell. Combined with maximize spell, he can use a 7th level slot for massive damage. Even just using a 4th level slot (which he had to do before he hit 14th obviously: 12 or 13d8 of force damage, no to-hit roll required, reflex save for half, is nothing to scoff at.
With his 30 charisma (18 base, 2 from being an aasimar, 2 from age, 2 from levels, and +6 from a cloak) he has 185 spell levels to dump. Granted, trading in a single lightning bolt for a single sacrifice bolt isn't cost effective, but trading in higher level slots (Mordenkinen's Magnificent Mansion is his only 7th level spell, and Greater Dispelling / Permanent Image are his 6th level spells) is definitely worth it. If I hadn't removed the duration, he'd be able to do 112 damage per round (DC 23 for half) for 12 rounds straight.
A final thing about comparing the sacrifice spell to lightning bolt: Sacrifice Spell is force, and thus effective against incorporeal creatures. Lightning Bolt is electrical, thus has a chance of being resisted or immune to. Sacrifice spel takes more energy, but also does d8s instead of d6s (max of 15 instead of 10).
Overall, as I've said, the spell itself isn't very broken, but can be overpowering when combining its duration with maximize spell.
To anyone thinking about getting the book: I'd highly recommend downloading the errtta as well, as it clears up a few issues (limiting flame bolt to 9 bolts for one. It also includes costs for the magic items.
Billybeanbag: Um... What d6? And also, why would it get used less at higher levels? Considering it scales with level as far as extra damage goes, I'd think it would get used more. I removed it (not because of power, but because it takes away too much from paladins.