I certainly use my gmail address for pretty much everything (unlessi need to use @google.com to confirm a discount or something). Particularly for software, if

I certainly use my gmail address for pretty much everything (unlessi need to use @google.com to confirm a discount or something). Particularly for software, if you think about it, it's a potential security risk to identify yourself as someone working for a prime target for hackers and (D)DoS'ers.