Frustratingly Remembering

So, in order to procrastinate on my work, I've been stockpiling this list on LibraryThing with all of the books I've ever read. Ever. Which is difficult in the first place, but it's fun to remember the books that I've read once upon a time, all of 10 years ago, and then add them to my ever-growing list.
And today, I remembered a handful of books and series that I read. After seeing "Fast Food Nation" with Aaron, the list just grew.
The problem is, I can't for the life of me remember the names of the books, so all I have are the general storylines in my brains, the covers of the books, but no means to find the books. I have been googling as much as I can, but to no avail.

So, for my own sake, I'm going to list the general jist of these young adult books I can't find (hoping I'll find them some day):
1) 4th grade reading: A story of a young boy who has to solve a mystery (perhaps a murder?) where there is a blue car, footprints going to a house, a lot of plastic pink flamingos....and a dog, which I think might be his. I feel like cookies may or may not be involved, but that might be my own wishes.
2) A trilogy where some girl befriends a ghost-girl in her room, during the summer time, and they try to make things right in both of their lives. The cover is very 80's-style, where the ghost girl looks shocked that she's dead, etc.
3) A book about a girl who all of a sudden starts channeling a girl who lives in ancient Egypt...it might very well be her in a past life? I think it's in the summertime, as well. The cover was also illustrated, with a girl looking shocked while staring into a river to see another shocked girl who looks like she's from Egypt.

If you have any idea what books these are, LET ME KNOW. It's driving me nuts.

Oh yeah, and I hung out with Dominique and her boyfriend today. We ate indian, and then we hung out in their temporary condo over in Times Square. It was incredibly pimp.