Hi, can I have a mis-spelling that url-forwards to a site that doesn't try to sell anything or have any advertisments?
It can still be trademark infringement - it's considered bad faith to trade upon someone else's trademark. It's really going to depend on the exact trademark you are talking about. A domain like appple.com wouldn't likely be infringement as it is a generic term - as long as your site had nothing to do with computers or music (or any other usage of Apple corp). A misspelling of Microsoft would be a different story - it's a unique name with worldwide recognition. No matter what the misspelling, if a trademark holder "thinks" it is infringing upon their trademark, they can sue you for infringement and force you to spend large sums of money to defend your position that it isn't. The commercial nature of the misspelled site won't matter if their position is that you are stealing their traffic meant for their site (most likely the purpose of having a misspelling in the first place) - and a disclaimer on the site won't help you because the "theft" has already occurred by the time they get a chance to read any disclaimer. You're going to have to convince a judge of why you are forwarding a url to another domain if your intent wasn't to get traffic meant for the trademark holder.
If you mean TM typo domains, then yes you can land in hot water because you are using the domain name in bad faith.
It depends on whether it's a trademark or not. If it's a trademark you could face some problems in the future.
It's called typo-squatting. http://en.wikipedia.org/wiki/Typosquatting Been around for years and for the most part TM infringement.