I'm always getting the question on how to view a logo or image in Microsoft CRM.  Well here is a quick customization you can add to your account form and view a logo.   Once you add this script on the 'OnLoad' event of the form, all you need to do is add an image called 'logo.jpg' as an attachment and everything will show up properly.   This customization will even work offline.

Script

var Loaded = false;

if(crmForm.FormType ==2 || crmForm.FormType ==3 || crmForm.FormType ==4)
{
    // get the notescontrol object
    var oNotes = document.getElementById("notescontrol");

    // attach an event so we know when the notecontrol is done loading
   oNotes.attachEvent('onreadystatechange', LoadLogo);

   // refresh the notecontrol
   oNotes.Refresh();
}

function LoadLogo()
{
   if (oNotes.readyState != 'complete')
      return;

   var oDoc = (oNotes.contentWindow || oNotes.contentDocument);
   if (oDoc.document) oDoc = oDoc.document;
   // attachment use SPAN tags
   var attachments = oDoc.body.getElementsByTagName("SPAN");

   //Iterate through all the attachments.
   for (var i = 0; i < attachments.length; i++)
   {
       // let's be certain we have an attachment here
       if (attachments[i].attachmentId)
       {
            // is this an image attachment
            if (attachments[i].innerHTML.match(/.*logo\.jpg$/i) && !Loaded)
            {
                  //Get a reference to the table
                 var tr = crmForm.all.name.parentNode.parentNode.parentNode.insertRow();
                 var td = tr.insertCell();
                 td.align="right"
                 td.colSpan=4;
                 td.innerHTML = "<img src='" + attachments[i].url.concat("?AttachmentType=", attachments[i].attachmentType,                                    "&AttachmentId=", attachments[i].attachmentId) + "'/>"
                  Loaded = true;
             }
       }
    }
}

When your done, your form should look like this.

If you really want to get creative you can go a little further and build a viewer to page through all images that are attached to the record.

This customization may not be supported by Microsoft and is provided as-is with no warranty.