diff --git a/chunk.py b/chunk.py
index 63de064..b9bc817 100644
--- a/chunk.py
+++ b/chunk.py
@@ -73,10 +73,10 @@ def get_blockarray(level):
     Block array, which just contains all the block ids"""
     return numpy.frombuffer(level['Blocks'], dtype=numpy.uint8).reshape((16,16,128))
 
-def get_blockarray_fromfile(world,filename):
-    """Same as get_blockarray except takes a filename and uses get_lvldata to
-    open it. This is a shortcut"""
-    level = get_lvldata(world,filename)
+def get_blockarray_fromfile(filename):
+    """Same as get_blockarray except takes a filename. This is a shortcut"""
+    d =  nbt.load_from_region(filename, x, y)
+    level = return d[1]['Level']
     return get_blockarray(level)
 
 def get_skylight_array(level):
diff --git a/contrib/findSigns.py b/contrib/findSigns.py
index c390654..9e3b621 100644
--- a/contrib/findSigns.py
+++ b/contrib/findSigns.py
@@ -33,30 +33,34 @@ if os.path.exists(worlddir):
 else:
     sys.exit("Bad WorldDir")
 
-matcher = re.compile(r"^c\..*\.dat$")
+matcher = re.compile(r"^r\..*\.mcr$")
 
 POI = []
 
 for dirpath, dirnames, filenames in os.walk(worlddir):
     for f in filenames:
         if matcher.match(f):
+            print f
             full = os.path.join(dirpath, f)
-            #print "inspecting %s" % full
-            data = nbt.load(full)[1]['Level']['TileEntities']
-            for entity in data:
-                if entity['id'] == 'Sign':
-                    msg=' \n'.join([entity['Text1'], entity['Text2'], entity['Text3'], entity['Text4']])
-                    #print "checking -->%s<--" % msg.strip()
-                    if msg.strip():
-                        newPOI = dict(type="sign",
-                                        x= entity['x'],
-                                        y= entity['y'],
-                                        z= entity['z'],
-                                        msg=msg,
-                                        chunk= (entity['x']/16, entity['z']/16),
-                                       )
-                        POI.append(newPOI)
-                        print "Found sign at (%d, %d, %d): %r" % (newPOI['x'], newPOI['y'], newPOI['z'], newPOI['msg'])
+            r = nbt.load_region(full)
+            chunks = r.get_chunks()
+            for x,y in chunks:
+                chunk = r.load_chunk(x,y).read_all()                
+                data = chunk[1]['Level']['TileEntities']
+                for entity in data:
+                    if entity['id'] == 'Sign':
+                        msg=' \n'.join([entity['Text1'], entity['Text2'], entity['Text3'], entity['Text4']])
+                        #print "checking -->%s<--" % msg.strip()
+                        if msg.strip():
+                            newPOI = dict(type="sign",
+                                            x= entity['x'],
+                                            y= entity['y'],
+                                            z= entity['z'],
+                                            msg=msg,
+                                            chunk= (entity['x']/16, entity['z']/16),
+                                           )
+                            POI.append(newPOI)
+                            print "Found sign at (%d, %d, %d): %r" % (newPOI['x'], newPOI['y'], newPOI['z'], newPOI['msg'])
 
 
 
diff --git a/contrib/rerenderBlocks.py b/contrib/rerenderBlocks.py
index 51940df..d0fa0df 100644
--- a/contrib/rerenderBlocks.py
+++ b/contrib/rerenderBlocks.py
@@ -7,8 +7,8 @@ blockID.  The output is a chunklist file that is suitable to use with the
 
 Example:
 
-python contrib/rerenderBlocks.py --ids=46,79,91 --world=world/> chunklist.txt
-    python overviewer.py --chunklist=chunklist.txt world/ output_dir/
+python contrib/rerenderBlocks.py --ids=46,79,91 --world=world/> regionlist.txt
+    python overviewer.py --regionlist=regionlist.txt world/ output_dir/
 
 This will rerender any chunks that contain either TNT (46), Ice (79), or 
 a Jack-O-Lantern (91)
@@ -42,15 +42,20 @@ ids = map(lambda x: int(x),options.ids.split(","))
 sys.stderr.write("Searching for these blocks: %r...\n" % ids)
 
 
-matcher = re.compile(r"^c\..*\.dat$")
+matcher = re.compile(r"^r\..*\.mcr$")
 
 for dirpath, dirnames, filenames in os.walk(options.world):
     for f in filenames:
         if matcher.match(f):
             full = os.path.join(dirpath, f)
-            blocks = get_blockarray_fromfile(full)
-            for i in ids:
-                if i in blocks:
-                    print full
-                    break
+            r = nbt.load_region(full)
+            chunks = r.get_chunks()
+            for x,y in chunks:
+                chunk = r.load_chunk(x,y).read_all()                
+                blocks = get_blockarray(chunk[1]['Level'])
+                for i in ids:
+                    if i in blocks:
+                        print full
+                        break
+