Anyone else been using the rgba property

Anyone else been using the rgba property in their sites. I now use it with code like. It degrades gracefully for me

#nav li li{

float: left;
position: relative;
width:7em;
text-align: center;
cursor: default;
border: 1px solid #fff;
border-top-style: none;
border-bottom-style: none;
background-color:#AAD1E7;
background-color:rgba(175, 212, 234,0.8);
}

I haven't but I really like the idea of it. Being able to not affect child elements is to nice of a plus.

Is Safari the only browser that really supports it right now though?

I found out that you don't want to use my code in IE as the li background dissappears.

Firefox 3 will support it but for now its safari 3