The site that Forbes warns about, is.leaked, allows you to obscure three characters of your address. It then shows the compromised addresses that are possible matches to your address. You don’t need to provide your full email address to them.
From the Forbes article:
A site — IsLeaked.com — to check if your address is in the leak immediately popped up. Blogger James Watt points out that the site was created September 8, the day before the list was posted to the Bitcoin forum, and is warning people not to use it, saying it might be a honey pot to collect email addresses.
A bit late of Google to release a statement and for the press (which initially hyped the isleaked site) to warn against it.