I was thinking about this today and had to search for the answer.
Figured someone else out there would find this information handy:
The following card sets are permitted in Standard tournaments:
* Shards of Alara
* Alara Reborn
* Magic 2010
* Rise of the Eldrazi (effective April 23, 2010)
* Magic 2011 (effective July 16, 2010)
There are currently no banned cards in Standard tournaments.
Now I am not too sure if introduction of RoE took Shards off this list. Maybe Someone can help me out here.
http://www.wizards.com/Magic/TCG/Resour ... frstandard