Here's how to make hanging indents for radiobuttonlists in ASP.Net!

You must choose RepeatLayout="Table" and then create styles to apply to that table.

[Test in IE7 and Firefox 2]

<style type="text/css">
    .rbChoice input { margin-left: -20px; }
    .rbChoice td { padding-left: 20px; }
</style> 

<asp:RadioButtonList
ID="RadioButtonListSessionChoice"
runat="server"
CssClass="rbChoice"
RepeatLayout="Table"
RepeatColumns="1"
/>