I personally have started using .png in my pages anyway. The way I see it, if you're still using IE6, you're probably neither a regular web user or online shopper and so you probably won't be much loss to my site/business anyhow :D
Just a quick side note about most of the alpha transparency .png hacks for IE6: Most of them affect the positioning and repeat value of the .png image if used as a background in your css. No matter what positioning or repeat value you give it, it "may" default to top left repeat. In order to fix this you need to apply a value of zoom: 1; . Hope that helps as well. Now if we can only get people to stop using IE6!