What we need is sh*t loads of Phoenix flags everywhere, banners, streamers and everything. Make it a wow factor then that would bring more people to games because they want to be part of the fun.
Agreed, Yellow Fever could work on its visual presence more so than its audible presence; still too many people turning up in EPL shirts and the like (flame away!) and not enough scarves up, flag flying, banner waving support. Melbourne and Sydney are probably the best examples of this.
Look at the visual support in my avatar (which was just a random square crop of a much bigger picture) or the crowd from a Victory match, and then compare it to a shot of YF.
Not saying I'm perfect or that we can't acheive this, of course we can. A great start would be for everyone to wear Nix/YF gear and most to have scarves and take it from there.
One issue we do have though, unlike the sky blue of Sydney for example, is we have 2 supporter shirt colours, black and yellow, which makes it look like less of a "wall" of support, if you know what I mean.
Edit - couldn't find the greatest example, but:

aussienixfan2008-03-29 18:30:55