I vote "other/undecided"!
To me, the tape on the mouth shows that Caylee was murdered, but I'm certainly not sure yet that KC is the murderer. Too many other people were not ruled out, cadaver dogs never taken to the players' homes, vehicles, places of interest, etc. There's also the possibility that the murderer was a stranger. All we know is that either Caylee's body or items that had been in contact with her (deceased) body were placed in the Pontiac trunk and possibly the Anthony backyard. KC is not the only person who had access to Caylee, the trunk, or the Anthony home and backyard.
Why did KC fail to report Caylee missing, that's the question, and why would she still not tell who killed Caylee all this time if she is innocent? Some possibilities: she's guilty, she was involved, she was coerced, she suffers from mental illness, she was drugged or on drugs and doesn't know what happened, or, she was convinced that Caylee was safe during the time she was missing (i.e. believed Caylee was with a friend or something along those lines, maybe as part of a scam she and they were trying to pull.)
Questions that remain: Why did friends who were with KC 24/7 not notice any smell if there was a body in her trunk or her car was reeking of decomposition? (No matter where she parked it in their apartment complex, someone would notice.) How could she drive a car if its trunk was "saturated with chloroform"? Also, if KC were the murderer, or knew Caylee's body was in the trunk of her car, why would she keep it there for days and drive around with it in there? Why would she dispose of the body so near her family home rather in any of a million better places? Why would she leave the tape on the mouth? Why would she put a bunch of items with Caylee's body and leave matching items in her home? Why would she stay in town instead of just leaving and telling her family she had Caylee with her and was starting a new life? What about the scams/frauds related to some of KC's friends in her cell phone (see FrankM thread, car parts scam, etc)? Could they be related in any way? What about the m.r. and other guy (see Keith W thread especially) who were hanging around in the woods near the remains site before the discovery of the body?
What motive could KC have to kill Caylee when there was no history whatsoever of violence or a bad attachment between KC and Caylee? All friends who'd known her throughout Caylee's life said that KC would never harm Caylee or let her be lost and not report her missing. KC had maintained her partying lifestyle throughout Caylee's life, Caylee had been healthy and perfectly fine all that time, right up to June 15. KC knew she could easily let her parents take Caylee if she really wanted to be rid of her motherly responsibilities full time. So what happened in June 08 that resulted in Caylee's death?
Who would have a strong enough motive to murder a small child? A mentally ill person? Someone who molested the child? Children of all ages have certainly been killed in gang retribution crimes. Or did this young mother just have the onset of mental illness or a radical personality change and suddenly murder her child for no reason? Kill her rather than simply dropping her off with family if she wanted to be a free bird?
If KC is a calculating murderer, why didn't she fake like she was worried after the disappearance? Why didn't she report it as a kidnapping at the time? After her arrest, why the strange stories to LE that would be disproved immediately? Why not tell plausible stories to help her own defense such as a complete stranger took Caylee, I didn't get a good look or the tag number? And again, why not put on an a big act of being terrified and griefstricken?
I don't put too much in the computer searches because anybody who watches crime and forensics TV programs might wikipedia or google any of the things KC did. Also, "breakin necks" is a truck club that some of her friends belong to, if she had googled on that club name, the other related items might easily come up. Also, the macabre images on KC's photobucket are (sadly) similar to those on thousands of young people's webpages, her friends had the same kind of images. I think many innocent things might have been twisted into something else in the coverage of this case. That said, I agree with others that the case is very hard to comprehend, I certainly can't rule KC out. I'm having to suspend judgment until the trial. Innocent until proven guilty. I really hope the truth is found for Caylee. My gut feeling is that KC might be convicted mainly due to her failure to report the child missing and her so-called "partying" during the disappearance, but that we will never know what actually happened. Thanks for the thread!