The new version 4.0 of Komodo is out. It's got all sorts of spiffy features for dynamic languages (Perl, PHP, Python, Ruby, TCL) as well as Rails support. But you know, right now I'm just not feeling the need for a $245 IDE for Rails development. Of course that may be just because I'm only doing little baby applications so far, but at the moment lightweight tools (like TextMate) are doing fine for me.