OK, refusing to look at previous answers till I post mine:
S

P

O

I

L

E

R

S

P

A

C

E


Quotes first:
Quote 1: Don't know.


Quote 2: Sounds like a CarolM fic? But not sure which one.

Quote 3: Don't know.

Quote 4: It's by Nan Smith - "Middle School"?

Quote 5: "If At First You Don't Succeed" by ML Thompson.

Quote 6: I should know this but I don't.

Quote 7: Don't know.

Quote 8: "Tempus: Four Play" by Female Hawk.

Quote 9: Don't know.

Quote 10: Don't know.


EXCERPT GUESSES:

Now for the excerpts: (Only the ones I didn't get already.)

Excerpt 1: Darn it! Still don't know!

Excerpt 2: A CarolM fic? "On The Other Hand"?

Excerpt 3: Still don't know.

Excerpt 6: Ooh, it's Bobbart with "The Return of Ultra Woman"!

Excerpt 7: Aargh. Still don't know.

Excerpt 9: "A Triangle With Three Sides" by anonpip?

Excerpt 10: Don't know.

OK, now I can go and read other people's answers and slap myself upside the head!