Ok are we ready for the Special Abilities debate? Think they need to go over this stuff a little better. Here are my sources if anyone has others please let me know:
Core pg. 221 & 554
Beatiary pg.304
Srd (which reads verbatim like pg. 554 of the Core PF book)
3.5 PHB pg. 142 & 180 (pg. 180 reads like pg. 221 of the Core PF book)
3.5 DMG pg. 289 (which is almost a copy of pg. 554 of the Core PF book with a chart thrown in to help confuse you.)
There's a reason they sound like each other... They are each other.

3.5 PHB/SRD also says: A spell-like ability has no verbal, somatic, or material component, nor does it require a focus or have an XP cost.
3.5 SRD Special Abilities
Pathfinder SRD Special Abilities
Point open for debate:
I think that Spell-Like Abilities(SLA), Supernatural Abilities(Su), and Extraordinary Abilities(Ex) should be on a scale of best down. For me that would be - Ex (1st), Su (2nd), and SLA (3rd).
So your Ex ability would allow for no components, no possibliy for dispel or countering, can not be negated, target gets no SR, and no AoO. Action: varies (swiift or reactionary)
That's all well and good by me. Extraordinary abilities are non-magical, anyway, like Improved Grab for a Dire Ape or Trip for a Wolf.
Su abilities would have to have at least a verbal component, can be dispelled or negated, but cannot be countered.
I feel the need to point out any Dragon's Breath Weapon. All are Su, but the only action is breathing, and none can be dispelled. Antimagic Field negates them, but that is rather high-power.
SLA's being on the bottom of the 'totem pole" would be just like spells in almost everyway. Components needed, can be dispelled or countered, subject to negation, target gets SR and they provoke AoO. Action: standard or full round.
With the above the only change to the RAW would be SLA's needing components. But it seems strange to me that a "power" that you can use standing stark still would provoke an AoO, so that's one of the reasons I believe you should add them. Also if your SLA is a "Ray" spell you don't need to point?? (somatic).
Let me know what you think guys and if you find out anything else.
HM
Then would the SLA take Arcane Spell Failure chance? Would an SLA-user have to use material components? The rules say they have no components, so why can't they just have no components (says this in PF and 3.5)? I can see justification in getting AoO'd because you have to focus on it, like on a spell. Your focus is elsewhere, your opponents take a swing at you while you are open. I don't mind that.
Supernatural abilities don't face that because they don't take focus, they are second nature.
I mean, it was balanced enough in 3.5 that they left it as such in PF. Why can't we just leave it as is, as it doesn't
need to be HR'd. If it ain't broke, don't fix it, as the saying goes.
Components, also, are only backed up by the Vancian casting system, and remain largely a flavor point. I have never bothered with typing or saying some kind of incantation in play, and I doubt I ever will. And the Metamagic feats Still/Silent Spell negate the need for them anyway. And neither of those feats say they negate any AoO.
As I see it, the AoO is for being focused on something other than the guy standing in front of you, waving a sword at you. If you can make the Concentration check, you keep your focus, don't get smacked, and keep the spell. If you get smacked or are too focused on dodging the guy, you lose the spell/SLA.
I'm going to say it again: If it ain't broke, don't fix it. Please, HM.