Ya, you need not to worry, keep doing directories but do directories in right category and first choose high page and instant approval directories it will beneficial for creating good links .
Directory submission is one of good way of off page optimization and one way link building.Submission good directories not hurt site rankings and other stuff.keep it up.
Best advice is to spend time on the BIG directories with lots of traffic. Not to waste time on little, quiet directories that few people find or see.
By definition, directories have enormous numbers of outgoing links, which devalues each respective link. Also, as with article directories, the pages that your links will appear on won't have the same Page Rank as the top level domain. So, if u can deal with that, it will help u more or less!
you submit 100 directories everyday? and is your site is getting better?.... did you check your backlinks?...
you should change your title, desc after 100 submissions you should also participate in other activities like blog posting, comment posting, article submission, social bookmarking, classified ad posting and forum posting.
why don't you do another activities like social book marking and article writing. It will help you much and side by keep on directory submission.
I agree... Some directories took almost 6 mos. before they approved links... Any way is there still benefits we can get from this directories? there are some thread on every forums that this are being devalued by Google...