Setting mmd and lookup fields?

Set and Get a Lookup Field
Set a lookup field
$lookupfield = $l.Fields["lookupfield"] -as [Microsoft.SharePoint.SPFieldLookup];
$lookuplist = $w.Lists[[Guid]$lookupfield.LookupList];
$sourcefield = $lookupfield.LookupField;
$lookupitem = $lookuplist.Items[0];
#-or-
$lookupitem = $lookuplist.GetItemByUniqueId([Guid]"{fc71b84c-74d4-4f7c-9eed-fb7a5fbe24a6}")
#-or-
$lookupitem = $lookuplist.GetItemById(1)
$lookupvalue = New-Object Microsoft.SharePoint.SPFieldLookupValue($lookupitem.ID,$lookupitem.ID.ToString());
$i["lookupfield"] = $lookupvalue;
$i.Update();
Get a lookup field
$lookupfieldvalue = $i["lookupfield"] -as [Microsoft.SharePoint.SPFieldLookupValue]
$lookupfieldvalue.LookupValue;

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