I had a Honda S2000 start button in my 2002 CRV .... Only costed me $35 (plus the guy installed it for free since he was local). And damn.... me likey !
My wife has the start button on her Corolla - few things they dont tell you before you get it:
If you leave the car in park by accident when you turn off (nothing to warn you since no key to remove and it doesn't bong or anything), it will drain the battery right down overnight.
If you have the engine running, open the car door to say step out and pick up the mail at the end of the drive and drop your keys when you do, it will merrily drive on for a while but wont restart after you have stopped, leaving you wondering where you lost your keys.
No prizes for guessing how my wife found out both of these....
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2004 4x4 SR5 V8 Titanium Silver - Sold Sept 2011
2011 4x4 TRD Sport v6 Tacoma