Thanks to a bit of copy-paste from SpringSource Tool Suite and an answer on Stack Overflow, I was able to bash together a little plugin to filter Spring Roo ITD files from Eclipse's Package Explorer and Project Explorer. It's free to use for any purpose as far as I'm concerned, especially because I didn't write any of it. To use it, take the file attached to this story and drop it into eclipse/plugins.
(I probably could have taken the plugin from STS and dropped it into the standard Eclipse but it also has other features that I don't need.)
