Not to scare you, but we just had $300 stolen from our checking account via paypal. Someone logged in and transfered the money to themselves (the website used was flashden.net) Paypal flagged it and then we asked for an inquiry. We finally got the money back after a week but it was still very scary and put us $300 short for those 7 days! I have had paypal for over 5 years and this was the first problem I ever had but it does make me really leary to use it anymore. I removed all my credit card backups on Paypal because I didn't want someone using them too. Paypal suggested I change my email and password every 30 days which is a total pain! I usually change my password every couple months and I never use the same one I have for other accounts, but they say if your email is posted around the web someone can use it to get in.
Just an FYI to be aware of.