Scotty
I was looking to see if I can download a movie for my kids to watch on the plane.  Below is the message from Blockbuster.  Does this mean I can't do it on a mac?  Any suggestions?
Thanks

Warning: our system does not currently support downloads for your browser/operating system.
Downloading and playing movies requires Internet Explorer 5.0 (or newer) and a PC running Windows XP or Windows Vista. Please load this page in Internet Explorer or
install the IE Tab Extension in Firefox (IE installation required). Thanks for downloading from blockbuster.com!
Click here to install the latest version of Internet Explorer.
Click here to install the Mozilla/Firefox IE Tab Extension. Installation help

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I'm saddened every time I see this sort of thing.  This means one thing.  The web designers are lazy.  They would rather make their site work with the worst browser out there than take the time to be sure that their service complies with the ACTUAL standards of the internet like Safari and Firefox do.  

Try using Firefox.  If that doesn't work, email them a nasty letter telling them to fire they web IT guys so they aren't shutting out about 17% of their customers.