If you want to manually force a flush of your local DNS cache on a Mac use the following:

dscacheutil -flushcache

Prior to 10.5.1 you can use:

lookupd -flushcache

Not only can you invoke and navigate Front Row all from the Apple remote but you can also put the computer to sleep or wake it from sleep by holding the play/pause button on the remote for three seconds.

Pressing any button on the remote wakes the computer.

This approach can also be helpful if you want to use a TV (or external display) with a MacBook or MacBook Pro while keeping the computer closed because you can connect the TV or display, sleep the computer by closing the lid and wake it with the remote.