Don’t use a weak password
I have seen too many times a system being compromised because of weak passwords. Here is a list of the top 250 hacked passwords. If you use anything close to one of these I urge you to change it asap.
http://www.duosecurity.com/docs/top250gawker.txt
About.com has a nice short article about how to create a secure password.
http://netsecurity.about.com/cs/generalsecurity/a/aa112103b.htm