OPCODE CACHE
============
  + scripts should not be compiled and stored more than once
  + memory usage information for windows version
  + shared memory overflow detection
  + crash detection
  - class_entry storing routine should not store parent class methods.
    Now they are stored twitch (for ZE1)

OPTIMIZER
=========
  - eliminate unnecessary INIT_FCALL_BY_NAME
  - eliminate unnecessary references to global variables
  - eliminate unnecessary RECV and RECV_INIT
  + ZE2 support

ENCODER & LOADER
================
  + support for ZE1
  + support for ZE2
  + support for 64-bit processors

SESSIONS
========
  + sessions locking (line "files" does)

CONTENT CACHING
===============
  - transparent content caching

ZE2 support
===========
  + opcode descriptors for new opcodes
  ? zend_op_array->prototype
  + zend_op_array->opcodes[x].handler
  - objects caching
  + optimizer for ZE2