You can still do them
I have another solution for you.
You can practice the free 150 questions exactly in a simulated exam environment by scheduling a Prometric Practice Test.
For details read here
http://www.usmle-forums.com/usmle-articles/719-usmle-prometric-practice-test.html
The only thing I think is that some Prometric Testing Centers may not have updated to the new 2011 questions, but you can ask them about that and I think the 2010 is absolutely OK as far as the software and the interface.
I have another solution for you.
You can practice the free 150 questions exactly in a simulated exam environment by scheduling a Prometric Practice Test.
For details read here
http://www.usmle-forums.com/usmle-articles/719-usmle-prometric-practice-test.html
The only thing I think is that some Prometric Testing Centers may not have updated to the new 2011 questions, but you can ask them about that and I think the 2010 is absolutely OK as far as the software and the interface.