Apple's Jobs, on medical leave appears on stage

SAN FRANCISCO (AP) — Apple CEO Steve Jobs made his second major public appearance since he went on medical leave in January. He received standing ovation as he appeared at a conference today, where he was expected to announce a new service called iCloud.

James Brown's "I Feel Good" played over the loudspeakers just before he walked on stage, looking thin, in his signature outfit of mock turtleneck and blue jeans.

One audience member shouted out, "we love you."

Before announcing iCloud, Jobs unveiled a new operating system for Mac computers called Lion. With it, Apple Inc. is expanding the number of "gestures" users can perform on a MacBook trackpad, for instance to jump from application to application.

In another nod to bringing the computer closer to the iPhone and iPad, Apple is also adapting more applications to run in full-screen mode rather than in smaller windows.

Jobs made a public appearance in March to announce a new iPad.