Original Image: [link]
(Click on the download button to view in full size, the small version looks fuzzy/crappy and have a black background)
Yep, another Liara T'soni render.
This image of Liara is from the latest Mass Effect 2 DLC 'Lair of the Shadowbroker'.
It's in PNG format so it's ready to use, just put it in Photoshop/GIMP, or whatever you use to make signatures.