All you have to do is use site:domain.com or site:
www.domain.com
You can go through the top 10 link lists and notice half will only have their main page indexed by yahoo - while having many pages indexed by other search engines like google, msn, etc.
You can also check using this thing
http://siteexplorer.search.yahoo.com/
Here is two quick examples using large well known link lists:
Link-o-rama doesn't seem to be effected by this
http://siteexplorer.search.yahoo.com...&bwmf=a&bwms=p
Penisbot seems to be effected only the main page is indexed
http://siteexplorer.search.yahoo.com...&bwmf=a&bwms=p