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Is there any free or commercial component written in .NET (no COM interop) that will work with most twain scanners?
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Just started a project in .net and found great info here (*dead link as of Feb 2014) about using Windows Image Acquisition. Lots of sample VB code and some c#.
Microsoft have an API all about scanning. It's called Windows Image Acquisition and you can read a great Coding4Fun article about it by none other than Scott Hanselman here.
Take a look at CodeProject: .NET TWAIN image scanning That might give you a good start.
Disclaimer: I work for Atalasoft
Atalasoft has a product, DotTwain, which has no COM interop (just direct calls to the twain dll from .NET) and gives you a completely .NET interface. It can be embedded in a browser hosted WinForms control, for instance, because it doesn't use COM.