In no particular order:

o integrate just4log into the build system
o testcases!!!!
o documentation of the rewriting process
o fix rewriting bugs/limitations:
  o fix unintialized objects for method/constructor calls
  o inner classes
  o try/catch/finally
  o synchronized(obj)
  o accessing .class
  o new Object() without assignment
o only wrap the function calls
  that may lead to a suspend (control
  flow analysis) requires 2-pass
  analysing/rewriting
o maybe: evaluate making the Stack class use a hierarchical
  approach to support differential continuations
o maybe: asm implementation instead of BCEL

o BCEL
  o commit bug fixes in BCEL

   http://issues.apache.org/bugzilla/show_bug.cgi?id=27646
   http://issues.apache.org/bugzilla/show_bug.cgi?id=27854
   http://issues.apache.org/bugzilla/show_bug.cgi?id=27855

  o get rid of the static repository approach
   http://issues.apache.org/bugzilla/show_bug.cgi?id=38057

o talk to the RIFE guys about joining forces
o talk to the aspectwerkz and aspectj folks
  about working together