How to get last transactions made to a non-wallet bitcoin address?
There is a blockchain tool call Obelisk which works like bitcoind in effect, they do have public servers open to save you having to download the whole blockchain. You need to install obelisk and sx tools (same authors).. 

Info:  http://libbitcoin.dyne.org/  also  http://sx.dyne.org/history.html
sx tools Git:  https://github.com/spesmilo/sx
Obelisk Git:  https://github.com/libbitcoin/obelisk/