You generally should not leave anything but letter, numbers, underscores and hyphens for any file names. If you use the apostrophes at all you should encode them but generally dont use them.
If you have use them you may find that the URL will be invalid when entering into some software or could bring conflicts as often SQL injection attacks use the ' within the query string.
Regarding being bad for SEO Google and MSN still index pages with apostrophes and from what i have seen, they index them with the same weight as other pages.
Hope this helps
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by: MMDeveloperPosted on 2008-08-06 at 14:12:45ID: 22175200
most top name (oscommerce, zen cart, x-cart) e-commerce website software I've worked with all stripped apostrophes out of URL's when it could. If it could not, it would urlencode() them. I personally don't know if an apostrophe is necessarily bad for SEO, but just what I have statistically seen, they had to have been doing it for a reason.