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Welcome :-)
I think it depends on whether all your pages are relative to the same things as the main page. Not to sure how others might see that point.
As for my domain (a directory of sorts) each index has keywords respective of the subject matter of that particular index.
Pendanticist.
I have found that you can use meta-tags on multiple pages with some success. I do agree with Pendantacist - each of your pages have specific topics... by using page content specific meta-tags will help your targeted traffic nicely when done well.
It allows for your site (page) to be found on searches then specific to those topics (content). This is on-top of what your index page may pull in, because you cannot possibly stuff that page with all the (meta-tags)content your site covers. You will have some search engines that give you better results with these 'inner' pages and some that don't. Every bit helps in this area.
Hope this helps -
-Scott