Best uses for Shapechange?

[nameless]

With the new ability to provide (Su) abilities in 3.5, what are the best forms you can find for Shapechange?

So far I've come up with the following:
-Beholder: Awesome tactical abilities. Disintegrate at will, which will absolutely destroy fortifications, or allow you to tunnel through solid rock very quickly.

-Choker: When you have some distance, this form has some insanely large benefits. Namely, the old-style haste ability of an extra standard action. Possibly the only way to currently gain that extra standard action.

-Dragon: High speed flight, high AC, and the ability to breathe for 18-20 dice of damage each round with a good DC. Nearly unbeatable form.

-Cloaker: Best for just a couple of rounds, its Moan is very versatile and powerful.

-Will-'o-the-wisp: Very hard to hurt. An (Ex) version of greater invisibility, immune to spells (Magic Missile barely matters, Maze could be a bummer). Great AC before other enchantments come into play. If you can cast Stilled spells, this is wonderful.

Anything else with wonderful little abilities to really stick it to the newly-more-dangerous opposition? (Or newly more dangerous PC's, as it was)

 

[Witch Doctor]

kobold...nobody ever suspects a small reptile sticking to the corners....until it's too late

 

[James McMurray]

If you're up against a melee type, DR 15/Epic from a Solar wouldn't hurt. Especially when it is coupled with Regeneration 15 and some good immunities / resistances.

 

[MarauderX]

Gelatinous Cube - Good for hiding in those 10'x10' closets

Rakshasa - good DR plus how many people carry blessed crossbow bolts?

Mind Flayer - just for the wide-eyed faces of your fellow adventurers (boo!)

Giant Squid or Octopus - Multiple long-reaching tentacles can keep your opponents at bay, grapple and drag them underwater to drown, or help you carry away that vast undersea treasure. Plus octopus has ink and better than chameleon camoflage.

 

[Someone]

You could tunnel more quickly in Umber Hulk form (you would have to work, though) But without entering in the realms of Epic (Gibbering orb...):

Leonal or Avoral: Lay on hands up to your max HP.

Barguest: Feed

Balor: lots of things, and that includes a vorpal sword.

Energy Drain (from multiple sources): Get a lot of temporal hit points

Iron golem: magic resistant, fire heals you and give temporal hit points.

12-headed (cryo or pyro)hydra: Fast healing and dangerous breath weapon.

Nymph: Unearthly beauty, this form is specially good for sorcerers, who can also use all their equipment.

¿where did the rakshasa´s inmunity to magic go?

Ravid: animate 1object/round. In a couple minutes, you could have a entire castle´s furniture dancing.

If you have a shapechanger buddy, one of you culd change into arrowhawk and shoot the other, who´s shapechanged into a Shambling mound, and get a maximum of about +1500 Con bonus.

Pixie: Greater invisibility and special arrows.

Treant: Animate trees.

Shadow, wraith: Kill anything without magic weapons.