Checkbook v1.4 by Robert J. Freepartner (released by Computer Craftware)  is a full fledged Checkbook (remember those?) program for the Commodore 64.  One neat feature of this software is that it not only supports the Commodore 1581 disk drive, it even supports using partitions.

Note - Although there is what appears to be a Commodore 128 versions of this software on the disk, it doesn't work.  I believe this disk may have been a 1571 floppy that was imaged as a 1541.  All the same, thank you Scott H. for providing this and other images.