Nice project, I already read about it. Still note that one of the major points of Redis is to support more complex types as values. Tokyo Cabinet is basically an on-disk hash table library, with an optional networking server using this lib to export the functionality.

For example if you want to use Redis in order to store logs from a lot of different computers, and you want to only take the last 1000 entries for every computer, all you need to do is for every computer something like this:

    RPUSH computer_5 "... your log line ..."
    LTRIM computer_5 0 999

Redis offers atomic LPOP/RPOP too, this makes pretty easy to create queues where different computers can pop/push values with the guarantee the operation is atomic.

Another trivial example: think about implementing something like YC with a key-value DB. Support for lists and sets will make your life much easier :)