The Ultimate Visual Studio Solution Structure

Realizing that this could be subjective based on the project at hand, I'm looking for the "best practice" method of structuring a VS (Visual Studio) Solution.

Please feel free to edit this, comment on what you think might be incorrect, suggest alternatives, etc. I'd love to see this Community Wiki grow into a great resource for people just starting with VS Solutions.

Below is what I have working for me now (on my current project), however I know for a fact that there is some stuff in the wrong place. In my scenario, I'm building a Web Application using MVC 2

Please post your idea of the ultimate solution structure so that we can get an idea of the "best way" / "best practice" (whatever that means exactly)

IE:
How do you break up your DAL (Data-Access-Layer) / BLL (Business-Logic-Layer)?
Do you put your repository layer and service layer inside your BLL? If you're using MVC (Model-View-Controller), do you keep your controllers in the UI instead of the Core?
Do you throw lots of stuff in your Utility/Miscellaneous folders, or do you break it apart even further?
etc...

• MySolution
  • MySolution.Core
    • Authentication
      • this is where I have a POCO and a method to searialize the poco into the userData secion of the auth cookie
    • Base
      • here is where I keep my BaseController and by BaseGlobal
    • Controllers
      • all of my controllers (obviously)
    • Domain
      • DatabaseModels
        • contains my L2S .dbml file
      • JsonModels
        • models used to pass JSON objects to the veiw
      • Repositories
      • Services
      • ViewModels
    • Extensions
      • all extension methods
    • Filters
      • Action Filters
    • Utilities
      • Apis
        • all third party API code goes in here
      • Badges
        • badge calculation goes here
      • MailClient
        • send plain text or html email using the classes in here
      • RoutingHelpers
        • contains a class to enable lowercase routes
      • also contains things that I don't know where else to put... IE: HTMLSanitizer, custom HtmlHelpers,UserInfo helper (IP address, browser, etc), DataConverter, etc
  • MySolution.UI
    • App_Browsers
    • Assets
      • Css
      • Images
      • Scripts
    • Views
    • Global.asax - inherits from BaseGlobal
    • Web.config

Screen Shots

Please feel free to comment accordingly, or better yet, post your own version (answer) below. I know that what I've got isn't the best way.