Input type=password, don't let browser remember the password

Try using autocomplete="off". Not sure if every browser supports it, though. MSDN docs here.

EDIT: Note: most browsers have dropped support for this attribute. See Is autocomplete="off" compatible with all modern browsers?

This is arguably something that should be left up to the user rather than the web site designer.

<input type="password" autocomplete="off" />

I'd just like to add that as a user I think this is very annoying and a hassle to overcome. I strongly recommend against using this as it will more than likely aggravate your users.

Passwords are already not stored in the MRU, and correctly configured public machines will not even save the username.

I solved in another way. You can try this.

<input id="passfld" type="text" autocomplete="off" />
<script type="text/javascript">
// Using jQuery
$(function(){                                               
    setTimeout(function(){
        $("input#passfld").attr("type","password");
    },10);
});


// or in pure javascript
 window.onload=function(){                                              
    setTimeout(function(){  
        document.getElementById('passfld').type = 'password';
    },10);
  }   
</script>

#another way

 <script type="text/javascript">    
 function setAutoCompleteOFF(tm){
    if(typeof tm =="undefined"){tm=10;}
    try{
    var inputs=$(".auto-complete-off,input[autocomplete=off]"); 
    setTimeout(function(){
        inputs.each(function(){     
            var old_value=$(this).attr("value");            
            var thisobj=$(this);            
            setTimeout(function(){  
                thisobj.removeClass("auto-complete-off").addClass("auto-complete-off-processed");
                thisobj.val(old_value);
            },tm);
         });
     },tm); 
    }catch(e){}
  }
 $(function(){                                              
        setAutoCompleteOFF();
    });
</script>

// you need to add attribute autocomplete="off" or you can add class .auto-complete-off into the input box and enjoy

Example:

  <input id="passfld" type="password" autocomplete="off" />
    OR
  <input id="passfld" class="auto-complete-off" type="password"  />