I'd also like to have it on the main page. With regards to the Stock Widget, at my school they only have PC's (running Firefox, so it's not that bad), so I don't have Dashboard. I check my e-mail and I check Macrumors, but I always have to manually (grr) navigate over to google.com to check how AAPL is doing for the day.
Maybe link the ticker statement to a nasdaq.com summary update? Those updates are very informational.
EDIT I also say non-live-update; I'm fine with clicking 'refresh', and that you could put it on the far right of the page, to the right of the "Got Mac Rumors/News? Submit it" in very small font, but on the right-most side of that little bar.