You might mean a vignette - which is created in post processing - most programmes can do it.
Its a photoshop filter (although it can be done in ACR as well). Its not immediately obvious where to find it.
Once your image is open in PS. Go to the menu bar and choose >filter > distort > lens correction.
In the dialog box that follows, you'll see a slider on the right to add or remove a vignette.
HTH
wicked, just tried it.. looks good, cheers