Domaining.in and 9ug.com recommended by SEOMoz
Recently SEOMoz published a list of the 400 top directories in different niches.
Domaining.in ranked in the top 15 of all general directories based on domain authority and MozRank!
I think that you have to be a Pro member to view the entire list but I will be adding my list of strong directories once I get some more time.
BTW: I just saw this interesting blog post about the value of submitting to directories and the SEOMoz directory list!