It worked through ROM Manager for me or at least I think it did. Before partitioning, I had 92mb of internal space. After partitioning apps2sd, I had 112mb of internal space. I assumed that meant it had worked.
When you say it doesn't work, what exactly do you mean? Does it go through the process, like rebooting into recovery, but when it finishes it hasn't done anything? Or do you get some error message in ROM Manager when you try to partition it?