In selecting a node to report on on a system with 1000s of nodes where only a few have timelogs linked to them is not useful.

What about:

--- bubbletimer.statistics.inc.orig     2010-08-03 09:22:35.000000000 +0200
+++ bubbletimer.statistics.inc  2010-08-03 09:23:33.000000000 +0200
@@ -169,7 +169,7 @@
     ),
   );
   
-  $result = db_query('SELECT nid, title FROM {node_revisions} WHERE length(title) > 0 ORDER BY nid ASC;');
+  $result = db_query('SELECT nid, title FROM {node_revisions} WHERE length(title) > 0 AND nid in (select distinct nid from {bubbletimer_activity}) ORDER BY nid ASC;');
   $nodes = array();
   while ($row = db_fetch_object($result)) {
     $nodes[$row->nid] = $row->title;