GMail, Google’s free webmail service is a top class service in comparison to Microsoft’s Hotmail or Yahoo Mail.
GMail which was “invite only”, recently opened up its service worldwide to everyone. Now all you to need to get a GMail account is to signup 
Now Google is even running Ads to promote GMail !!
No second thoughts, GMail’s spam filter is THE best and they are marketing the same via their ads.
If anyone is not using GMail as their primary E-Mail ID, its time to switch
Checkout this video (from Google) to get a quick overview of GMail’s features
Update
James has found another GMail Ad; this time showing GMail’s search feature
Popularity: 5% [?]
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Where did you see that ad?
In my website itself on the index page, I guess it showed up in reference to my earlier post