I have had a lot of these spoof messages too and forwarded them to Paypal. A word to anyone who may have been fooled by these scammers:
Log into your Paypal account immediately and change your password. If you wait too long, your account will be taken over by these thieves.
Another way to identify these emails as being fake is by simply doing a mouseover of the links in the email. Most times it shows another URL that most times does not even have the word Paypal in it. I looked at one once and it showed something like [TEXT]http://russhy.com:8080/stats.edi.ru/redir?=677y8mnvn[/TEXT] (TEXT is used to prevent automatic hyperlinking). If that is not suspicious, I don't know what is. All these links do is redirect you to a site that captures your username and password. If you have clicked on any of the links in these spoof emails, remember to login to Paypal and change your password now!