Like the Archive button in gmail but still use Thunderbird? Check out this extension that allows you easily add an Archive button to your toolbar that does just that – archive the selected email(s) into a particular folder.
chuonthis.com – Maximum Extension – Thunderbird Extension: Buttons!
This extension adds buttons to Thunderbird which can be added to the toolbars. Read the features to see what buttons are added to which toolbars.