Have you cleared the browser cache (temporary
internet files for IE)?
Does your ISP or host use a proxy server that
caches old pages for a while? (AOL used to cache
pages for up to 48 hours)
Are you publishing to the correct location?
Can you give a link to a page and also post some
of the new content on that page so we can check
if it is displaying for other people?
Have you opened the remote site in FrontPage and
checked the pages in FrontPage?