I've got Dropbox on this 9.04 desktop and a Statler α2 laptop. Symlinks in the ~/Dropbox folder point to folders like ~/scripts or ~/documents. Works perfectly except that when scripts are updated from the other box they lose their executability, so you have to put it back manually. (Security-wise that might not be so terrible.) Otherwise great. 
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Little script to check out your /~scripts, or other, folder and ask with zenity if you want to restore executability. Maybe run it in autostart.sh with a couple of minutes delay:
#!/bin/bash
# check if files in a directory ($1, or default ~/scripts) are executable
editor=leafpad # leafpad's quick
path="${1:-$HOME/scripts}" # use ~/scripts if no argument is given
path="${path%/}" # remove any final slash
[ -d "$path" ] || { echo "$0: $path is not a directory" >&2; exit 1; }
for i in "$path"/*
do
[[ -x $i ]] && continue
$editor "$i" & edpid=$!
sleep 1 # wait for editor to open so zenity is on top
zenity --question --text="file $i is not executable.
Make it executable?" && chmod +x "$i"
kill $edpid
done
exit 0
John
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“Good morning sir, which way up would you like your reality today?” "As it comes, Jeeves, as it comes..."