If you're mining on a Mac install a fan control app so you can monitor and adjust the fan speeds if things get a little hot (which they will).
I doubt you'll find it profitable though.
I'm mining with my MacBook Pro but only as part of a pool, and only when I'm using it anyway. For 24/7 mining I useother more suitable machines.
smcFanControl:
http://www.macupdate.com/app/mac/23049/smcfancontrol