Well, as everyone has already said, the mouse for general Pc use is a fairly major no no.
However, I can see it having possibilities in games, sinse it offers a much finer level of control than the keyboard (it has been used apparently in main stream fps and sim games for a long while for this reason).
However, it is more difficult to opperate in most situations, whether menues or a game itself.
Personally, while my mouse has actually been completely out of batteries for the past year, simply because I didn't use the thing, but sinse more audio games are taking advantage of it, I'll certainly be dusting it off again.
As far as mice go, it'll be interesting to see what Rale racer does with the mouse, sinse that's shaping up to be an extremely major commercial audio game, and the developer has already stated that even though keyboard support is optional, mouse control is heavily recommended. for more info see the blind adrenaline site
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)