Currently I use Eclipse, with some plugins, for my Ruby on Rails development. A cool feature of Subversion is that you can have an ignore list to prevent files/folders from being checked when synchronizing with the repository. And Eclipse support that feature. The problem I had was that whenever I right-click on a file, I find the "Add to svn:ignore..." link disabled!
After some Googles, I found that you cannot add files to svn:ignore once they have been checked in. So, if you create a new file/folder, that doesn't exist in the repository, in your local project, you would find the link enabled for that file.