What type of directory submission is usefull for our website ranking & what type of directory is harmfull.

In old SEO practice directory plays a vital role in SEO but now it has no importance in SEO. Infact I have stoped doing this for my website now.

Which type is useful for directory submission ? Either which process is helpful.? Anyone can explain me the details of what type of process applied for SEO. ?

I agree with you Kristina. but if directory site's having good Page Rank & related with our website catogary then can we submitted or not?