I've just released a maintenance build of xPad to deal with a few Leopard issues. Please download xPad, version 1.2.6. This release solves all but one visual bug, in which document title labels in the drawer become lighter after changing documents a few times. When I have a while to play with it, I hope to fix that bug as well. In the mean time, it's completely usable with this release.
And, of course, it's still free.