The preferred method these days is to use '$()' instead of backticks, however if you use an editor with syntax highlighting you'll quickly see the issue/s:
Code:
aaaa=`zenity --list --title="simple organizer" --text="Welcome! What would you like to do?"` --column=Action "Make a notebook"`
if [ "$aaaa" == "Make a notebook" ]
then
1=`zenity --entry --title="simple organizer" --text="What do you want to call it?"`
cd ./notebooks
#mkdir "$1"
#cd "$1"
blah=`zenity --list --title="simple organizer" --text="Would you like to make a new page? Or leave it blank?" --column=Action "New page" "Leave it blank"`
zenity --text=Test
fi
You have an extra backtick in the middle of the first line and you're missing a 'fi' to end the 'if' block.
<edit>Also, when pasting code please use code tags so we can see the layout, I have no idea where your if block was supposed to end</edit>