Scott Hanselman has a good tip to protect your clients’ clients’ privacy.

This is one a lot of people know, but it's worth covering again because it's easily forgotten as it's a small detail. Since we do eFinance sites, we often don't want folks' UserNames collected and stored in AutoComplete, especially when the site is browsed on a public machine.

autocomplete="off" method="post" runat="server">

Note that autocomplete="false" doesn't work. However, autocomplete="off" works in both IE and FireFox.