   To do:  2. eqv?  
   *       3. more I/O support (read) (display) (newline)
   *       4. strings, vectors, etc. and other data types
   *       5. separate compilation support
   *       6. fix up global defines -- should be data labels
   *       7. re-think IL to provide support for unboxed/untagged ints,
   *             closures, etc.  then hack in optimizations to avoid 
   *             checks (a la Henglein).
   *       8. exception support
   *       9. let-binding isn't nested
   *       10. other special forms (e.g. begin...)
   *       11. symbols, quoting
   *       12. math functions -- rational numbers, arithmetic

Don't even want to try:
- continuations
- eval
- multiple return values
- macros (can we find a pkg for these somewhere?)
- force/delay   
   



