Hopefully I'm not too late on this one, but you can certainly use a partially transparent PNG on a site, and have it work fine in IE6. You just need to use a conditional comment to call in the extra stylesheet to override the default, and insert the IE-only AlphaImageLoader to display it properly. You just have to be careful - you have to be sure you don't have the outer container (that the background is set in) with any position setting, and be sure any anchor tags have a position:relative setting - otherwise your links will cease to function.
Just thought I'd pass that along - it works very well, looks nice, and is definitely much lighter code than trying to use the opacity filter.
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