There are a lot of states indexed now. If you're having trouble keeping up with which are indexed and which are not, I created a simple chart showing which indexes are available on Ancestry.com and FamilySearch.
This is an alphabetical listing of all the states so you can also see which states are missing. With so many indexed it's easy to forget one state you might need. This is printable on letter size paper if you want a quick reference and you can add your own marks as the final remaining states are indexed. Get the pdf chart here.