For those that don’t know Mylyn:
Mylyn is the Task-Focused UI for Eclipse that reduces information overload and makes multi-tasking easy. It does this by making tasks a first class part of Eclipse, and integrating rich and offline editing for repositories such as Bugzilla, Trac, and JIRA
I ended up finding the following URL and doing a ‘Software Update’ (help -> Software Updates -> Find and install -> Search for new features to install) in Eclipse:
There are 2 .jar which I needed to already have to successfully install the full Mylyn package (according to my Aptana), but as I don’t develop in Java I could remove them from the installation by unchecking the checkboxes on the “Software Updates” page.
If you don’t uncheck these then you won’t be able to install.
After that just restart Aptana and you’re done :)
For some reason the perspective is called “Planning” and not “Mylyn”, in case you can’t find it!
There are some cool tutorials floating around for Mylyn including this one.