I have one website with adsense and I blocked many url's and categories which are not relevant to my website. But now i am opening a new website and those blocked url's/categrories will be relevant for this website, and need to be unblocked. As i cannot open 2 adsense accounts, so how can i overcome from this problem. Thanks in advance.
Why not do like me and allow everything, let adsense do its job. I know it can be tempting if you have only one topic, but still, adsense is able to deal with context, its technology is over 10 years old, it's a big boy now..
I have to say I agree with JamesColin above, don't worry about the blocking. Let Google decide what urls and categories are appropriate for your site - Remember adsense is personalised for the VISITOR not the website, so ads that google deem relevant for your visitor are displayed. This is another reason to just let Google do their job.