My problem here is that I would like to know more about which adsense adds are effective, but the size limit on channels is 30 characters, and nearlydrferox.blogging4life.com is 31 characters, so I can't use a channel. If I leave off the .com, would the channel still work, or does it have to be a valid web address?
name it anything you like -- "header_ad" or "in_post_ad" or "left_side_ad" ... If you are following multiple sites, just use an identifier for each site.
i use for instance: "mydentify-sub-cat-300x250" or "itsmyitaly-citylist-160x600" basicly the website name, the location, then the size. this is what works for me.