In that case, then yes, it's been at least considered. The _C++ Template Metaprogramming_ book has it as an exercise, exercise 7-8 and calls it crossproduct_view.
Note to self: read the book :-). The MPL learning curve is steep and every little bit should help.
A solution is posted here:
http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?CPPTM_Answers...
It would be interesting to compare the two solutions. The exercise just specified 2 input sequences whereas your's allows (I guess) any n>0 number of input sequences.
No, they don't look similar. As far as I can tell from a one-minute look, the solution is simply a nested for_each loop and does not provide an actual sequence adapter, despite the name cross_product_view. Mine is a lazy view implemented using a sequence of iterator "digits". ...Max...