I installed Aptana Studio 3 and I set it to work with svn repository. I'm able to checkout a project from repository in my local disk.
I would like to know:
Aptana Studio uses Subversive plug-in for Eclipse IDE to support Apache Subversion. See it's User Guide here.
You can view changes in 'Synchronize View'; the page describes different status icons of so-called "synchronization states". You can also view the list changes in your working copy in command prompt, by running svn status
against your WC.
Read SVNBook.