Lion's Heart let's you ignore the penalties from a single type of ability score damage, but not the consequences of having an effective 0 in the stat. The Promethean Oracle curse is the only thing that comes to mind to pair it with (aside from Blood Money which the PCs shouldn't have anyways) but I'm sure there's some other source of voluntary ability score damage that's fun to combine it with.
Dragon Gold Crown is useless on a PC in a normal wealth campaign (just take craft wondrous item!), but useful as a feat to boost NPC sorcerer/oracle/anti-paladin/bard/seducer witch/whatevers without adding wealth to an encounter.
Daylight Diadem produces light treated as actual sunlight, which has relatively few methods of creation.
Decorum Band is useful on its own as intended, but can milk a lot of information about what subjects make an NPC uncomfortable.
Alluring Light doesn't allow luring people into hazards, but it does bunch enemies up nicely for AoEs and is an aggro drawing effect. Spell duration is broken though.
Shell of Sending is a telephone, albeit only to the paired shell. Still very useful.
Edit: The penultimate 1E book, Heroes of Golarion is out.
Phoenix bloodline has no off-list bonus spells on its spells known, but most of the ones granted are decent or better picks. The abilities are decent but unexceptional. 1st level power gives you two extra cantrips you'd pick anyways (meh but better than the blasts you typically get) and instant ID of any non-cursed magic item you hold charisma mod a day which is interesting and potentially adventure breaking given it doesn't exclude artifacts and a few APs give the PCs one they aren't supposed to know all the properties of right away, but really just saves you a skill point per level on Spellcraft. Inflammation was as crap as it seemed. Wings indeed don't have a duration. 15th level ability is greater restoration as a SLA, which is nice since that has a 5000 GP tax if cast as a spell.
Unicorn Bloodline gives a bunch of healing spells and lets you heal as you blast with its arcana. Abilities are all meh though. It does thankfully say straight out that it's descent from unicorn
riders, not actual unicorns.
Spell Cartridges makes firearms not worry about ammo and, as far as I can tell, semi-auto as long as you can keep up an Arcane Strike. Recall ammunition lets you return missed shots to your gun (requires spellcraft and uses "magical abilities" but doesn't say anything about AMF) which seems useless most of the time but I'm sure there's some special splash weapon ammo somewhere that does stuff even on a miss or (failing that) is stupidly expensive.
Jaguar series of slayer talents is solid but nothing amazing. First removes the penalty to non-lethal damage, which is OK. Second and third add useful riders (disarm/trip attempt against flatfooted opponent and penalty to hit anyone but you) to sneak attack.