I just checked your other site:
http://search.yahoo.com/search/dir?p...&fl=0&fr=slv1-
and it appears that you aren't in there, as well.
Yahoo! definitely seems to be gaining ground in the search engine wars, and more and more people are using Yahoo! lately.
The litmus test that I like to use is to do a search for your most popular keyword phrase. In this case, I did a search for 'carpet tools'. Sine the majority of sites for that term aren't in the directory, then having a directory listing could definitely help you rise to the top.