Saw this mentioned here, so I tried it out. Looks very need and the 
debugger also work while rdt kept crashing  Eclipse 3.0
while debugging.

One thing that I notice is Arachno Ruby is not supporting attr, 
attr_reader, etc. yet...as the variables doesn't show up in
the navigator tree. I think this is an important thing to have as most 
ruby code I have seen use this heavily.

-DJ