Hi,
Save the following into a file:
(progn (print :aaaaaaaaaa) (finish-output))
(progn ;; C-c C-c while your cursor is at the left parenthesis on this line (print :bbbbbbbbbb) (finish-output))
Fire up Lisp and Slime. Move your cursor to the position specified in the above comment and you'll see :AAAAAAAAAA printed out in Slime's REPL. I believe doing the same thing a few weeks ago would print out :BBBBBBBBBB. I have to say I like the old way much more than the new one.
A bit more info: Slime: the latest from CVS Gnu Emacs 21.4.1 CMUCL: 2005-09 snapshot
Best wishes,
-cph