Here's a way:
Missing Sync (for the Mac, but hopefully with whatever you use) comes with a program called Mark/Space Notebook. When you sync with Missing Sync click "notes" and your blackberry MemoPad will have the notes from the Notebook program and vice versa. This program is similar to other note taking programs like Sticky Brain --worth taking a look. I type in notes directly to the Notebook program or cut and paste from wherever. Does not support formatting. Also, does not retain the category based organization in Notebook.