New release from the Brennan Center.  From the overview:

Since the beginning of 2013,

• At least 75 restrictive bills were introduced in 30 states.

• Of those, 64 restrictive bills are still pending in 26 states.

• Of those, 25 restrictive bills are currently active in 15 states, in that there has been legislative activity beyond introduction and referral to committee (such as hearings or votes).

• Two states have already passed 3 restrictive bills this session — Virginia and Arkansas both passed restrictive legislation requiring a photo ID to vote, and Virginia passed legislation making voter registration harder.