Hello i got some domain name that have some trademarks in them. i never knew about this until, just now i started to read about it. for example onhi5.com ondigg.com onorkut.com i got those 3 is it illegal to have those domain name?
It is not illegal to have them, but in most cases it would be illegal to use, develop, or park them (trademark infringement).
bluegrass is right. Its not a smart idea to try and profit off someone else's brand. Here's a simple incident... http://richcanadian.com/blog.php?id=18