Even our Directories Forum Charter [webmasterworld.com] asks
So our discussion here should not be to list specific directories. How Google treats any particular directory might well change over the future anyway, so let leave a thread here for the future -- one that discusses traits of directories that Google trets well, rather than specific directory names (that would lead into a marketing war, anyway.)
My view: getting a few solid directory links is certainly one common and "safe" way to begin. Getting ONLY directory links is not likely to be of much benefit.