If, like me, you lack a certain amount of inspiration when trying to generate secure passwords pwgen may be the answer for you. It has heaps of options (see below) and can assist you to generate new secure passwords for your users. Thanks to the cygwin project you can use it on Windows aswell.
sudo apt-get install pwgen
Download and Install cygwin and select to install pwgen
you@yourbox:~$ pwgen 9 1 iqueZi4pa # generates 1 password 9 characters long with the default options
bash-3.2$ pwgen --help Usage: pwgen [ OPTIONS ] [ pw_length ] [ num_pw ] Options supported by pwgen: -c or --capitalize Include at least one capital letter in the password -A or --no-capitalize Don't include capital letters in the password -n or --numerals Include at least one number in the password -0 or --no-numerals Don't include numbers in the password -y or --symbols Include at least one special symbol in the password -s or --secure Generate completely random passwords -B or --ambiguous Don't include ambiguous characters in the password -h or --help Print a help message -H or --sha1=path/to/file[#seed] Use sha1 hash of given file as a (not so) random generator -C Print the generated passwords in columns -1 Don't print the generated passwords in columns -v or --no-vowels Do not use any vowels so as to avoid accidental nasty words