[arethuza]

What about this one?

http://trentrichardson.com/examples/timepicker/

It extends the standard jQuery UI datepicker but you can turn off the date picker part leaving the time picker.

[latchkey]

I've recently explored a lot of these different time widgets.

I didn't like that one because dragging a slider for the time seemed like a lot of work.

I'd rather click, so I ended up with this one that is based on jquery ui as well: http://fgelinas.com/code/timepicker/