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Is that a good indication that Google has not crawled my site?
It could even be that it was crawled but not updated in the index. You can only tell by a look at your log files.
Remote diagnosis (since I don't know the site etc.): You need much more incoming links with good anchor text to achieve a more regular updating schedule.
Are all of your pages in the index? How high is the PR?
I would recommend to link "Home" on every page to your main index page ("index.htm"), I would also recommend to let your top banner point to your home instead of the current page.
I strongly recommend to get access to your raw log files if possible.
After you have restructured your navigation with home included I would get some fresh incoming links to get Googlebot to your "/".
Hope that helps.