My question is about the difference between compressed keys and addresses, and i know it was addressed in another question but my question is less about the theory and more about how the keys are used practically in Bitcoin.
So heres what I did: I used
dumpprivkey for an address (183Tw2TqXKkbk5ZeocTYwmxg8x46ADXb6c) in the .7.2 client, and got L5DTi7rgqsPg7Vq1vTU2dP2HWMEsNM5w5JCqEDXXXXXXXXXXXX. When i pasted this into bitaddress.org's wallet details script it returned several things. First, it showed a different address (1FKswUuFsjWKyr4ZPSe3vEpp1iCXXChBZm), but it also showed the address above and said it was the compressed version. I sent like 0.0001 to each of the 2 addresses and my satoshi client only shows a transaction recieved from the 183 (compressed) address.
Can someone please explain in practical terms what the difference is and why they both even exist in Bitcoin? Any help is appreciated.