In this illustrated tutorial, I will show you how to do both.
Adding Gtalk Contacts to AIM
To begin connecting Google chat and AIM, select the "Options" menu, located on the top, right-hand corner of your AIM Buddy List. From the drop-down menu, select "Add to Buddy List," and then "Add Buddy" from the secondary menu.
Users can also press Ctrl+D on your keyboard for faster access.