being a recently converted Tiki enthusiast, I've been experimenting with a number of fine Tiki drinks, including the Mai Tai.  It's hard to go too wrong with a decently made Mai Tai, but there's still room for both error and improvement.  After checking out some of the advice on Tiki Central, last night I tried one with fresh Key lime juice (instead of fresh Meyer lime) and homemade Orgeat (made to this recipe) instead of the commercial Torani stuff.  The improvement was quite noticeable, and even Vikki liked it (she's not generally a Mai Tai fan).  The Key lime juice was sweeter, and less bitter, and the homemade Orgeat was less sweet, and not so artificially almondy.  So altogether:

2 oz. Appleton Estate Jamaican rum

1.5 oz. Key lime juice

.75 oz. Bols Curacao (the only brand I could find)

.5 oz. orgeat

.5 Malibu coconut rum (not traditional, perhaps, but a very nice addition)