Hello,
It seems rather difficult to find a free c++ for Pocket PC. wxWinCE seems to require Embedded Visual Tools 3 or 4 which are not free (for what I know). Moreover, I have seen an article on how convert a Embedded Visual Tools 3 or 4 project to Visual Studio 2005. May be M$ is trying to make Pocket PC developers move to Visual Studio 2005. Unfortunately, it seems that Visual Studio Express is not suitable for that ( :roll:).
May be you can give a try to
Pocket GCC. The project seems to be dead

, but they speak about a Yahoo Group. May be you can check there.
Michael
PS.: Intel C++ compiler seems now to support Pocket PC development, but it is not free and you have to buy a license

.