diff --git a/core/src/processing/core/PApplet.java b/core/src/processing/core/PApplet.java
index 176bbc990..fee97f253 100644
--- a/core/src/processing/core/PApplet.java
+++ b/core/src/processing/core/PApplet.java
@@ -2805,8 +2805,12 @@ public class PApplet extends Applet
   }
 
 
-  static public final float lerp(float a, float b, float amt) {
-    return a + (b-a) * amt;
+  static public final float lerp(float start, float stop, float amt) {
+    return start + (stop-start) * amt;
+  }
+
+  static public final float unlerp(float start, float stop, float value) {
+    return (value - start) / (stop - start);
   }
 
   static public final float constrain(float amt, float low, float high) {
diff --git a/core/todo.txt b/core/todo.txt
index 3e0bc83f9..c65908e33 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -2,14 +2,28 @@
 X add saveStream() method
 X change to handle Java 1.5 f-up where URLs now give FileNotFoundException
 X   http://dev.processing.org/bugs/show_bug.cgi?id=403
+X add unlerp() method
+
+_ loadBytes() and saveStream() functions badly need optimization!
+_   don't bother using a buffering stream, just handle internally. gah!
 
 _ make lerpColor honor the current color mode
 _   though that's awkward b/c colors always RGB
 _   lerpColor(c1, c2, amt, RGB/HSB/???)
+_   http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Suggestions;action=display;num=1160096087
 
-_ with default renderer, no default background color set(!)
+_ with default renderer, no default background color?
 
+_ optimizations to opengl
+_   disabling error reporting (what's taking it so long?)
+_     maybe use a hint() to enable it? or a getError() function?
+_   make cached display list of filled/non-filled ellipse.. rect.. etc
+_     these don't work when the vertex colors change, but..
+_   or maybe should be using vertex arrays?
+
+- make a note in the pdf reference that createFont() messed with 1.5
 _ figure out what's breaking pdf font stuff, see if it's the 1.5 problem
+_   filed as bug #4769141 with apple
 _ fonts in java 1.5 have changed again
 _   appears that asking for the postscript name no longer works
 _   fix "create font" and associated font stuff to straighten it out
@@ -26,7 +40,6 @@ _   may be that cff fonts won't work?
 _   or is it only those with ps names?
 _   http://processing.org/discourse/yabb_beta/YaBB.cgi?board=SoftwareBugs;action=display;num=1117445969
 
-
 _ alloc() stuff not fixed because of thread halting
 _   problem where alloc happens inside setup(), so, uh..
 _   http://dev.processing.org/bugs/show_bug.cgi?id=369
diff --git a/todo.txt b/todo.txt
index 31725fe21..33d05b841 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,6 +1,18 @@
 0119 pde
 X .java files weren't working in 116+
 X   http://dev.processing.org/bugs/show_bug.cgi?id=405
+_ need new copy of Capture example that has a new name
+_   http://dev.processing.org/bugs/show_bug.cgi?id=408
+
+_ createFont() should always use native fonts
+_   need to warn that fonts may not be installed
+_   recommend that people include the ttf if that's the thing
+_   or rather, that this is only recommended for offline use
+
+_ macosx having trouble finding monaco
+_   changing font size, 
+_   http://processing.org/discourse/yabb_beta/YaBB.cgi?board=SoftwareBugs;action=display;num=1160057791
+_   http://dev.processing.org/bugs/show_bug.cgi?id=406
 
 _ need to document changes to int() (no longer accepts boolean)
 _ also parseInt and parseFloat, how they can return another number of NaN