(as long as the terms of service of the submission sites don't require unique articles).
Whether it's a good idea
, though... that's an entirely different question.
With the Google changes over the past three years, especially the Panda updates, having the same content available in multiple places is no longer a good thing. (Not that it was ever such a good thing from a user experience standpoint -- I mean, seriously, what's the point in showing the exact same article to everybody a dozen times in a dozen different places? It's just annoying... -- but now it can actually lead to Google penalties.)