I'm running Eclipse Indigo on OSX 10.7.2, and I cannot get counterclockwise to work properly. If I open the REPL view, it will accept input (and display the input), but not actually evaluate any expressions. When I attempt to force a repl reconnect, I get a java.lang.NullPointerException (no stack trace though).
Attempting to load a clojure project into the repl via the run configuration locks up Eclipse.
It turns out this is a newly reported bug in counterclockwise, according to their developers.