val myList = List("foo")
val myFun: (String) => EitherT[Future, Exception, Int] = (in: String) => EitherT { Future { try { \/-(in.toInt) } catch { case NonFatal(e: Exception) => -\/(e) } }}

// Regular traverse
Traverse[List].traverse[({type G[A]=EitherT[Future,Exception,A]})#G, String, Int](myList)(myFun)

// TraverseU to the rescue!
Traverse[List].traverseU(myList)(myFun)

// Pimpin' to the rescue!
myList.traverseU(myFun)