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In the old days, navigating your site with the toolbar installed seemed to bring Googlebot running, but not so much now. Particpating in Google's Sitemap Program [google.com] might be helpful -- you'll definitely ghet feedback about any problems they encounter trying to crawl your site -- no guaranteed on indexing, butr it sure doesn't hurt.
And Slurp is usually attentive, but it can be slow to make the deeper crawl. MSNbot is just crawling crazy right now. Sometimes I think they rebuild the entire index from scratch every 30 days, but that just can't be true, can it?