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You can find blocked sites by DMOZ category. Simply search for a category or type in a couple of letters and it will bring up all the sites classified in that category that are blocked. Some sites may be not be categorised correctly.
You can view each site and check that it is real and not squatted. If you think a site is mistakenly blocked, you can report them to the ISP by pressing the Report Site button.
To find more blocked sites, try the parent category, Recreation