Original Message:
Spells that specifically target familiars:- Animate Dead Familiar: instant duration; makes your dead familiar undead ... it has to die first, so there might be xp-loss

(SB)
- Augment Familiar: +4 to Str, Dex, Con, 5/magic DR, and +2 to saving throws (CW)
- Elemental Familiar: instant duration; turns your familiar into a tiny elemental (SB)
- Enhance Familiar: can be permanency'd; +2 competence to attack/saves/damage, +2 dodge AC (T&B)
- Familiar Pocket: can be permanency'd; creates an extradimensional pocket on your clothing that the familiar can enter/leave as a free action (T&B)
- Fortify Familiar: can be permanency'd; +2 enhancement to natural armor, 25% fortification, 2d8 temporary HP (T&B)
- Imbue Familiar with Spell Ability: transfers some of the casters daily spells (T&B)
- Planar Familiar: instant duration; turns your familiar into a Celestial/Fiendish/Axiomatic/Anarchic creature, depending on the alignment of your god (SB)
- Dragon 280 also has the following spells: Familiar's Sense, Familiar's Touch, Share Life, Familiar's Form, Call Familiar
Feats:- Bonded Familiar (PH2)
- Celestial Familiar (BoED)
- Combat Familiar (PH2)
- Construct Familiar (Drag 280) ... change type
- Dragon Familiar (Drac)
- Enspell Familiar (Drag 280) shared spell works up to 1 mile
- Extra Familiar (Drag 280)
- Familiar Concentration (LEoF) familiar can maintain concentration for caster
- Familiar Spell (DMG:epic, Und:general) - familiar can cast spells
- Improved Familiar (CW: Guardian Familiars) (FRCS) (RoF) (SK) (T&B)
check out the nice list further on in this thread:
http://boards1.wizards.com/showpost.php?p=8838824&postcount=167- Lurking Familiar (PH2)
- Obtain Familiar (CA) gives you a familiar, with the familiar abilities depending on your total arcane caster class levels
- Planar Familiar (Plan)
- Shadowform Familiar (CoR) familiar gains incorporeal subtype (you have to be a Krinth)
- Spell-Linked Familiar (PH2)
- Stitched Flesh Familiar (LM) get an undead version of a normal familiar and control more undead

- Token Familiar (Drag 280) familiar can assume statue-like form
- Undead Familiar (Drag 280) ... start with an undead familiar, without xp-loss
(Prestige) Classes:- Alienist PrC lvl 5: adds pseudonatural template to your familiar (CA)
- Bonded Summoner PrC: turns your familiar into a powerfull elemental (MH)
- Changeling wizard 5 substitution level: "Morphic Familiar" lets your familiar change between it's possible forms at will. Very cool for a standard familiar, but once you add in Improved Familiar ... (RoE)
- Elf wizard 3 substitution level: doubles the bonus you gain from your familiar (RotW)
- Fleshwarper increases your familiar's size
- Raptorian wizard 1 substitution level: gives you a small air elemental as familiar (RotW)
alternative familiars- Dragon 277 page 65: badger, chipmunk, dog, eagle, groundhog, lizard, monkey, otter, small constrictor snake
- Dragon 280 page 60: bird, dog, fox, hare, lizard, mouse, otter, raccoon, skunk, squirrel
- Dragon 323 has two good familiar options. The Moth/Butterfly gives +3 to spellcraft checks. The Hummingbird, quite possibly the best basic familiar (although the raven can be better), grants +4 initiative.
the "casting" familiar- max out use magic device and give him your wands / staffs
- imbue familiar with spell ability (T&B) / contingency / improved contingency (T&B) / symbul's spell matrix/sequencer (MaF/PgtF) ... all allow your familiar to cast spells
- cast a spell and let your familiar "hold the charge" untill you really need the spell ... works just like a quickened spell
tips & tricks- the raven and some of the "improved familiars" can speak, so can use command word items
- alter self (
this thread by PhaedusXY), polymorph and shapechange can also change your familiar into something more suited to combat/survival/whatever ... the alter self/polymorph bit works best when your familiar already is an outsider
- familiars use the masters skills, so use the aid another action to get +2 on the masters checks
- for
"Clever uses of the Share Spells ability", check out
this thread by PhaedusXYBoED: Book of Exalted Deeds
CA: Complete Arcana
CoR: Champions of Ruin
CW: Complete Warrior
Drac: Draconomicon
Drag: Dragon Magazine
FRCS: Forgotten Realms Campaign Setting
LEoF: Lost Empire of Faerun
LM: Libris Mortis
MaF: Magic of Faerun
MH: Miniatures Handbook
PgtF: Players Guide to Faerun
Plan: Planar Handbook
RoE: Races of Eberron
RoF: Races of Faerun
RotW: Races of the Wild
SB:
WotC - Spellbook Archive SK: Serpent Kingdoms
T&B: Tome and Blood
Und: Underdark
You can also check:
WotC's Rules of the Game: Familiars ... although sometimes it brings only more obscurity.
And another trick: If you take Improved Familiar to get a Pseudodragon, and find a way to trade out its Alertness feat (Dark Chaos Feat Shuffle, Psychic Reformation, retraining, etc), you can give it Mindsight from Lords of Madness.