Akash: Thank you. In fact, neither the IP nor any site is banned. I already have talked to google and we are discussing the issue. If something is banned, I would have known. I would at least know that from searching google.
edifice: I appreciate your efforts. Yes there are similar situations. If you check google sitemaps group (at google groups), you will see that this started in late 2005.
WOW While I am typing this, I checked google sitemaps to find the maps working! The Error mark was removed
I checked the latest hits log and google has been dining at my sites today! Media Partner agent and googlebot agent made themselves at home and surprised me
I am glad as this nightmare is over!
edifice I will reward you with a PR6 link to your site for sincerely trying to help. This is the least I can do. I will PM you the details