If with listing, users can post their reviews, can rate it it can help to increase visibility as well to decide users from where they should make purchase, or to take services. I understand everything has some thought process behind, hence not challenging, just consider it as a suggestion
Good try. There is actually another project already doing well in this field:
http://btcpages.net/They offer directory listing plus reviews/rating, etc.
To the original OP, I think you should at least add a search box at the top.