ASP.net Google/Bing map

I am writing a website that manages a list of companys which can be based globally but mainly UK. I want a ASPX page (vb) written that incorporates a map (from Google or Bing) and then puts markers on it pinpointing different addresses which are populated from a SQL Server database. You can either build a process which adds coordinates to the database records or coordinates can be calculated on the fly. There mat be 50-100 companys so the later may not be a goer. The markers on the map should be able to be colour coded red, yellow or green depending on a value in the table and the tool tip should show the company name. I would like the different views, UK, Europe and worldwide. Thanks, David