I happened upon this webpage
which describes a method to pick a password that the current
(as of the date of this note) version of L0phtcrack cannot guess. Even
if they update L0phtcrack these should make it take significantly longer
to crack a password.
Basically they are just extended characters that you can get by holding
down the alt key then typing a 3 digit number on the numeric keypad. The
additional characters are:
You can read the full story at the above link I posted (I wanted to put
a copy here incase that page should get moved or something). Good stuff!