We are looking for a prototyping tool to allow our business analysts (and myself) mockup sites. Some people have suggested using the MS Expression suite of tools for this. I am worried it might be a bit too technical for the non-programmers.
Does anyone have any experience using Expressions Web (or Blend) as a prototyping tool? Is there anything else anyone would recommend.
I would not recommend that. You should use something that isn't intended for real application design. Mockups shouldn't look real, and your mockup tool shouldn't be difficult to use. When mockups look real, users get confused when the actual product looks different.