Python - 52
=

    print" ".join([bin(ord(i))[2:]for i in raw_input()])

<s>I'll work on translating this into Pyth.</s> Someone else did a Pyth answer already.

If you don't care about it being a full program or about I/O format and use Python 3, you can do it in 23 bytes like this:

    [bin(ord(i))for i in x]

`x` is the input.

I know this doesn't count because the interpreter wasn't released before the challenge was posted, but here it is in KSFTgolf:

    oan