They are both aimed at the same audience – the non-technical computer user. Could you tell that just by looking at getfirefox.com? What about playogg.org? Both of them have the ultimate goal of trying to persuade this user to install software. Which is more likely to succeed?
This post is not just finger-pointing; if playogg.org want my help, I’ll gladly give it. But I would have thought that just sitting down, looking at the page and thinking “if my mum arrived here, what would she think?” would lead to a load of improvements without a word from me or anyone else.