I put adsense link unit 160x90 link this, very close to my other links on one of my blogs, is it ok or does Google not like this?
If it looks really similar, for me there would be a problem. But link units are safer to push the limits with, since they cost money to the advertizers only on the second click.
its not a problem. Google says that you can create ads just like your contents so that people may click on the ads just by thinking as a content. there will be no problem.