At the moment I have 2 emails, one hotmail/live and one gmail. [Available on request, if you want it. I don't know why you would...]
I'm thinking for phasing out my hotmail/live one and just using my gmail.
But, I have 2 questions.
1) Is there a benefit to using gmail over hotmail?
2) Are there any services that dislike gmail? [I'm guessing Xbox live doesn't like gmail.]