I am not certain, but think SCTA and ECTA use the same Helmet rules ??
Either way... as of Today... 2005 is the latest/most recent Spec and is good through 2015.
The prior Snell 2000 spec is good "through" 2010
Sometime in 2010 you should be able to buy a Snell 2010 spec good through 2020
Since the rule for today is being written before the 2010 spec is out, the best Snell spec readily available is the 2005 spec and that is what you will need in 2011, that is the written word, but in 2011 you may use the 2005 "or later" that will be the 2010 spec in the next rule update.. the "or later" is a key phrase..
Just like a roll cage,, if the rules says 1 5/8 .120 wall .. that is the minimum,, however you may go above the minimum and you may use 1 5/8 .134 wall or even go to 1 3/4 etc. etc. etc..
Of Fire system, rules says 5lbs of agent,, you can opt to use more,,, etc. etc. etc..
So when todays rule says Snell 2005 (which is the latest as of press time) when the Snell 2010 comes out, it can be used as it exceeds the current minimum rating !!!
Why is this hard to understand ?