Instead of preconfigured Apt packages, they now seem to provide one package(rpmforge-release) including Apt, Smart and Yum and all configurations.
They also recommend Smart over Apt.
As for compatibility problems, it looks like this is fixed as well:
http://rpmforge.net/user/faq/All known problems have been fixed. If you still find a problem and suspect one of our packages, let us know on the packagers mailinglist and we'll try to get this fixed with the Fedora Extras packagers. We can't help if we don't know your problem.
PS: Is their a reason for using Smart over Apt?