Hi, I'm starting a blog and - being practical and wanting not to spend too much money - I decided to use one of my domains that was used for some redirect scripts. I used it as redirect on tumblr and in time the domain accumulated PR 3. Now I'm wondering if Google will downgrade my SEO at some point because these backlinks are not related to subject I'm planning to blog on (my subject is programming related). What do you guys think? Go with new domain or use one that already has a bunch of backlinks?