From the dictionary:
mad |mad|
adjective ( madder , maddest )
mentally ill; insane : he felt as if he were going mad.
• (of a person, conduct, or an idea) extremely foolish or ill-advised : they were all mad to go believing such a cock-and-bull story.
• in a frenzied mental or physical state : she pictured loved ones mad with anxiety about her | it was a mad dash to get ready.
• informal enthusiastic about someone or something : I wasn't mad about mountain bikes | [in combination ] a sports-mad nation.
• informal very angry : they were mad at each other.
• (of a dog) rabid.
• Brit., informal very exciting.
Andy, take your pick.
I'd say: enthusiastic about something... 
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