I have a 13" white unibody MacBook from 2010 which I'd like to use with the Apple remote, to control keynote presentations. According to this question, I need an external IR reciever for the remote to work with my MacBook. Would an IR receiver actually work, and if so, what are my options?
If you're looking to control Keynote presentations and your Mac doesn't have a built-in IR port, you could buy an external receiver, but I suggest you use either:
The Keynote Remote app for iPhone. This works over wi-fi and requires only a $0.99 purchase and no additional hardware to buy or set up.
A specialized slide advancer, like this Logitech one. This is designed to be comfortable to hold (the Apple Remote wasn't) and doesn't require line-of-sight to the receiver (which is a small USB dongle) to work. Some of the better ones have a slide counter and laser pointers built in.