Updated readme and todos.

README.md

@@ -273,7 +273,8 @@ Unless you add `ImageIO.scanForPlugins()` somewhere in your code, the plugins mi
 I addition, servlet contexts dynamically loads and unloads classes (using a new class loader per context).
 If you restart your application, old classes will by default remain in memory forever (because the next time
 `scanForPlugins` is called, it's another `ClassLoader` that scans/loads classes, and thus they will be new instances
-in the registry).
+in the registry). If a read is attempted using one of the remaining ("old") readers, weird exceptions
+(like `NullPointerException`s when accessing `static final` initialized fields) may occur.
 
 To work around both the discovery problem and the resource leak,
 it is recommended to use the `IIOProviderContextListener` that implements

imageio/todo.txt

@@ -1,3 +1,8 @@
+- FileChannelImageInputStream/MappedByteBufferImageInputStream
+- FileChannelCacheImageInputStream
+- FileChannelImageOutputStream
+- FileChannelCacheImageOutputStream
+
 - Consider creating a raw ImageReader (or util class?) that can read raw bitmaps:
     o Interleaved (A)RGB (as in BMP, PICT, IFF PBM etc) -> A1R1G1B1, A2R2G2B2, ..., AnRnGnNn
     o Channeled (A)RGB (as in Photoshop)                -> A1A2...An, R1R2...Rn, G1G2...Gn, B1B2...Bn