My website has consistently shown up in the top 5 Yahoo web search rseults under 2 particual keyword searc terms; recently it is no showing up at all even though it is still showing up under other keywords; could my site be dropped or blocked only under some keywords? Will it get re-listed? Please help, Mel

Just because you stopped ranking for certain keywords doesn't mean you've been banned. If your pages show up for other phrases then you haven't been banned at all and are simply no longer ranking for those other terms.

Search results vary. Just because you rank well for something today doesn't mean you will tomorrow. There can be many reasons why you're not ranking for those terms, but we would need to know the url and the phrases to be able to help.

Wait a few days, and keep working on SEO, if there is nothing wrong, your site shall be back.