I think this is similar to this question, but I'm having a slightly different problem.
I've been using an external LaCie drive for my Time Machine and SuperDuper backups. But I was getting messages that the Time Machine drive was full, and the SuperDuper runs out of room.
I went into LaCie Backups.backupdb and grabbed a bunch of old Time Machine backups and dragged them into the trash.
Trash has been trying to delete them for over 24 hours with no end in sight. So I stopped it and tried to bring the files back in to Backups.backupdb, but it won't let me.
So I've got all these files I can't trash, but can't put back.