this thread on the issue of specifying offline storage to external SD was started 1st August 2011. It's now 14th June 2012 and not even a trace of progress. Being able to select a location for storage away from internal storage is a significant feature. Given that applications of all kinds don't seem to have any problems providing this, it would appear to be trivial to implement. So, the lack of action can only imply that evernote has no intention of implementing this. (Why? .. who knows. Presumably someone thinks it would be a great idea to not be able to store offline info on external SD).