They seem to currently be gone from 4e, probably under the idea that anything that hinders the PCs is not fun.
I must admit however, that I used very few cursed items as a GM. Many were just kind of silly, others seemed to have no real purpose. When I do use cursed items however, they were special. Something like the Cursed Blade of Baron Ilharp, that makes its wielder stronger in battle, but makes him less able to see any solution to a problem aside from violence (done by applying penalties to any task he tries to talk his way out of/deal with diplomatically). Something like that is neat, and gives the PCs a hook to try to find a way to remove the curse from the weapon, rather than just throwing it away (or uncursing the target so they can throw it away).