We are not here to teach you how to hack gmail or myspace. If you think this is the place for that, you may need to refer to the term "ethical" in the domain name. Honestly, even if you tried asking this question on an unethical hacker forum, you would not get the response you are looking for.... with that said, we are more than willing to share our experiences and knowledge with you.
There are various attack vectors when it comes to online systems. Man in the middle attacks, social engineering, and password guessing to name a few.
When it comes to any system (gmail in this example), how do you add more security? Log in using HTTPS (which is the default now for gmail), which encrypts the logon credentials. Also using a large as possible password with upper and lower case letters, numbers, and special characters. Do not share your password on multiple systems. On the client side, install anti-virus, firewalls, anti-spyware, and anti-malware, to make sure nobody is looking over your shoulder (literally and figuratively). Do not use publicly accessible terminals or wifi. If you are using wifi at home enable the highest level of encryption and change your keys frequently.
Last edited by unsupported
on Tue Feb 16, 2010 1:19 pm, edited 1 time in total.
CISSP, GCIH, GCIA, C|EH, Sec+, Net+, MCP