In-case you are wondering what passwords not to use… Here is the top 500 list of passwords that were leaked http://lifehacker.com/5-million-gmail-passwords-leaked-check-yours-now-1632983265
Please note that there was more than gmail that had passwords. Basically the story goes like this. Some hackers in Russia took a bunch of password lists from other hacks and joined them together into lists separated by email. The total number of passwords actually released was 11,873,069.
To check if your email was leaked, visit https://gec.im/passwords/
Source code at https://github.com/GRMrGecko/PasswordCheck