Tables?
They just....don't look good. At least when I make them. Sizeing the tables properly is also difficult for some reason.
Flash?
Well, true, latest version isn't commonplace for most users, but I don't use things like the majorly in-depth actionscript that is associated with an update. Most things I make can run in Flash 4. Noone I know DOESN'T have ANY flash at all, and since this is more of a personal site than a heavy traffic one, I should be fine.
P.S. Updating isn't all that difficult. Heck, there hasn't been a pop-up installation box since flash 7. Just go to the site, and you're done.