Sid is pretty much retired. He makes very rare occasional appearances now and then. He still looks pretty much the same. I believe he has been in a couple films like Monsters Brawl along with some other wrestlers. He stopped competing regularly after getting injured in early 2001. Watch some of Van Dam's matches against Jerry Lynn and Sabu. As for your questions. 1. Yes The Rock and Hogan fought at Wrestlemania 18. They had a good match which the crowd really enjoyed and even started cheering bad guy Hogan during the match which Rock won. 2. You are correct. In terms of still being under contract to WWF/WWE and still wrestling (occasionally) The Undertaker has been there the longest. 3. Not very many. From when Hogan first won the belt in early 84 the only other wrestlers to hold the title were Andre the Giant, Macho Man Randy Savage and Ultimate warrior in 1990. Even during 90-93 the only others, aside from Hogan and Savage, to hold the belt were Sgt Slaughter, Ric Flair, Yokozuna, Undertaker and Bret Hart. 4. The first wrestler to beat Hulk Hogan for the title was Andre The Giant.