I agree, more games with horses would have been better if they used Epona instead.
Pokemon - sorry Rapidash!
FFX - move aside, Ixion!
Animal Crossing - f*** Buck!
I think there are other games that could benefit from using Epona instead of going horseless, too. Imagine the gates and broken bridges you could jump with her in Portal!
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http://img812.imageshack.us/img812/3492/eponaharr.jpg
Nominate E P O N A.