Not clear yet if it'll make it into the core ASP.NET framework but here's a Microsoft codeplex project for csssprites :
http://aspnet.codeplex.com/releases/view/50869
if you like it - use it - or just like the idea then add a comment. I think this would be a great thing to have in the ASP.NET framework. Have not personally used it (I had to invent the wheel myself) but its got good reviews.
It includes the following components:
- API for automatically generating sprites and inline images
- Controls and helpers which provide a convenient way of calling into the API
Features Added in Second Release:
- A CSS linking control for Web Forms (selects the proper CSS file for the user's browser, but does not display an image)
- Using custom folder paths other than App_Sprites
- Changing the tiling direction of sprite images
- Merging the generated CSS with a user's own CSS
Features under consideration for future releases:
- Automatically selecting the most efficient sprite background colour
- Automatically minifying the rendered CSS
- Compiling against .NET 3.5