Aptana Studio just updated to version 1.5, this means great things for the native linux users! Now all you need to do is simply extract the tar some place and run the AptanaStudio script. For my purposes I extracted the tar to my desktop then:
sudo mv ~/Desktop/Aptana\ Studio\ 1.5/ /usr/local/aptana
sudo ln -sf /usr/local/aptana/AptanaStudio /usr/local/bin/aptana
Now you can run Aptana Studio by typing ‘aptana’ in your terminal or create a nice menu icon for the program. Happy developing!