Hi,
    Eventhough my code works i still get the error "The page does not bind to the record ID value (in order to link to the record detail page) " when i tried to check in the challenge. any help is appreciated.
code below:
<apex:page standardController="Account" recordSetVar="accounts" >
   <apex:pageBlock title="Account List">
      <!-- accounts List -->
       <apex:repeat value="{! accounts }" var="a">
          <li>
            <apex:outputLink value="/{!LEFT(a.Id,15)}">/{!LEFT(a.Id,15)} </apex:outputLink>
          </li>
</apex:repeat>
</apex:pageBlock>
</apex:page>

Thanks