Links to remote websites are now shown in a different colour, this makes them easy to spot in large posts.
Additionally, if you hover your mouse over the link a thumbnail image of the link will pop up after a few seconds.
You don't need to do anything special when posting a link, it's automatic.
Give it a go here.
http://www.compingclub.comThumbnails are on by default, if you want to turn this feature off,
Click on "My Layout" on the left and remove the checkbox for 'Show small thumbnails for external linked websites.'