Rudo is a simple command line based todo list editor.  Here are the commands:

# see the first n items on the list (default 5)
rudo

# see all items on the list
rudo all

# add a task to the list
rudo add 'my task'

# mark the first task finished
rudo done

# mark the 5th task finished
rudo done 5

# mark the first 3 tasks finished
rudo done 3x

# move the first item to the back of the list
rudo walk

# move the first 3 items to the back of the list
rudo walk 3

# step through all the tasks in your list, with option to delete and switch speed
rudo review

# change the title of a task
rudo change 3

# list tags
rudo tag

# list items associated with a tag
rudo tag 'blah'

# add a tag to an item
rudo tag 3

# add in tasks from Remember the Milk
rudo rtm_add

More to come, including integration with Remember the Milk and more advanced list management tools